Heterocyclic Building Blocks-benzodioxan

Name is 2,3-Dihydro-1,4-benzodioxine-6-carboxylic acid, as a common heterocyclic compound, it belongs to benzodioxans compound, and cas is 4442-54-0, its synthesis route is as follows.,4442-54-0

General procedure: A mixture of compound 9 or 10 (0.11 mmol), O-(7-aza-1H-benzotriazol-1-yl)-N,N,N’,N’-tetramethyluronium hexafluorophosphate (0.21mmol), and N,N-diisopropylethylamine (0.54 mmol) in dry DMF (1.5 mL) was stirred at 0 ¡ãC for 30 min. The appropriate acid (0.16 mmol) was then added. After stirring at room temperature for 1-4 h, the reaction mixture was diluted with saturated aqueous NaHCO3, and extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous MgSO4, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with EtOAc-hexane (1:1 to 1:3) to afford the corresponding compounds 11a-o and 12a-c.

With the complex challenges of chemical substances, we look forward to future research findings about 2,3-Dihydro-1,4-benzodioxine-6-carboxylic acid

Reference£º
Article; Koh, Eun Jeong; El-Gamal, Mohammed I.; Oh, Chang-Hyun; Lee, So Ha; Sim, Taebo; Kim, Garam; Choi, Hong Seok; Hong, Jun Hee; Lee, Sang-Gi; Yoo, Kyung Ho; European Journal of Medicinal Chemistry; vol. 70; (2013); p. 10 – 21;,
Benzodioxan
1,4-Benzodioxane | C8H8O2 – PubChem

4442-54-0, 2,3-Dihydro-1,4-benzodioxine-6-carboxylic acid is a benzodioxans compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

General procedure: NEt3 (0.57?mL, 4.00?mmol) was added dropwise to a suspension of 3-methoxyphenylacetic acid (0.60?g, 4.00?mmol) and [Ti(eta5-C5H5)2Cl2] (0.50?g, 2.00?mmol) in toluene (50?mL) at room temperature. The reaction mixture colour changed immediately from deep red to orange and was then stirred for 3?h at 80?¡ãC. The mixture was decanted and filtered to remove the triethylammonium chloride salt. The filtrate was then concentrated and cooled to ?30?¡ãC to give orange crystals of the complex which were isolated by filtration., 4442-54-0

4442-54-0 2,3-Dihydro-1,4-benzodioxine-6-carboxylic acid 2758833, abenzodioxans compound, is more and more widely used in various fields.

Reference£º
Article; Ceballos-Torres, Jesu?s; Caballero-Rodri?guez, Mari?a J.; Prashar, Sanjiv; Paschke, Reinhard; Steinborn, Dirk; Kaluerovic?, Goran N.; Go?mez-Ruiz, Santiago; Journal of Organometallic Chemistry; vol. 716; (2012); p. 201 – 207;,
Benzodioxan
1,4-Benzodioxane | C8H8O2 – PubChem

As a common heterocyclic compound, it belongs to quinuclidine compound,Quinuclidine-4-carboxylic acid hydrochloride,40117-63-3,Molecular formula: C8H14ClNO398,mainly used in chemical industry, its synthesis route is as follows.,2879-20-1

a 2-Bromo-1-(2,3-dihydro-1,4-benzodioxin-6-yl)ethan-1-one By using 1-(2,3-dihydro-1,4-benzodioxin-6-yl)ethan-1-one (1.42 g, 7.97 mmol), the title compound was obtained as pale yellow solid by similar procedures to those of Example 38a (2.05 g, yield: 100%). 1H-NMR(CDCl3): 7.50-7.54(2H,m), 6.93(1H,m), 4.37(2H,s), 4.32-4.35(2H,m), 4.27-4.31(2H,m)

With the synthetic route has been constantly updated, we look forward to future research findings about 1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)ethanone,belong benzodioxans compound

Reference£º
Patent; Yamabe, Haruko; Okuyama, Masahiro; Nakao, Akira; Ooizumi, Mitsuru; Saito, Ken-ichi; US2003/212094; (2003); A1;,
Benzodioxan
1,4-Benzodioxane | C8H8O2 – PubChem

2,3-Dihydro-1,4-benzodioxine-6-carboxylic acid, cas is 4442-54-0, it is a common heterocyclic compound, the benzodioxans compound, its synthesis route is as follows.,4442-54-0

A mixture of 2,3-dihydrobenzo[b][1,4]dioxine-6-carboxylic acid (1 mmol) with concentrated sulfuric acid (0.5 mL) in methanol(30 mL) was heated at 65¡ãC overnight. The solvent was removed in vacuo, the oil was dissolved in ethyl acetate (20 mL) and extracted with water (40 mL). After drying the organic layer with anhydrous Na2SO4and evaporating the solvent under reduced pressure asolid precipitate was formed. It was recrystallized fromethanol.

With the rapid development of chemical substances, we look forward to future research findings about 2,3-Dihydro-1,4-benzodioxine-6-carboxylic acid

Reference£º
Article; Wang; Liu; Xu; Sun; Russian Journal of General Chemistry; vol. 87; 11; (2017); p. 2671 – 2677; Zh. Obshch. Khim.; vol. 87; 11; (2017); p. 2671 – 2677,7;,
Benzodioxan
1,4-Benzodioxane | C8H8O2 – PubChem

As a common heterocyclic compound, it belongs to benzodioxans compound, name is 2,3-Dihydrobenzo[b][1,4]dioxine-5-carboxylic acid, and cas is 4442-53-9, its synthesis route is as follows.,4442-53-9

EXAMPLE 59; 2-r(7,3-Dihydro-benzori,41dioxine-5-carbonyl)-aminol-indan-2-carboxylic acid ethyl ester (59):To a solution of 2,3-dihydro-benzo[l,4]dioxine-5-carboxylic acid (351mg, 1.95mmol), 2- amino-indan-2-carboxylic acid ethyl ester (400mg, 1.95mmol), HATU (1.1 Ig, 2.93mmol) in anhydrous DMF (8mL) is added DIPEA (484muL, 2.93mmol). The resulting solution is stirred at RT overnight. After the removal of DMF in vacuo, the residue is dissolved in EtOAc (7OmL) and washed with water (I x 1OmL) and brine (2 x 1OmL). The organic layer is dried over anhydrous Na2SO4 and concentrated in vacuo. The residue is purified by HPLC to give a pure product (59) as white solid (650mg, 91 percent).1H NMR (CDCl3, 300MHz): delta 1.24(t, 3H), 3.39(d, 2H), 3.74(d, 2H), 4.21- 4.33(m, 6H), 6.90(t,IH), 6.98(dd, IH), 7.17-7.24(m, 4H), 7.69(dd, IH), 8.25(s, IH)LC/MS (ES+) m/z = 368.15

With the complex challenges of chemical substances, we look forward to future research findings about 4442-53-9,belong benzodioxans compound

Reference£º
Patent; SANOFI-AVENTIS; WO2008/151211; (2008); A1;,
Benzodioxan
1,4-Benzodioxane | C8H8O2 – PubChem

2,3-Dihydrobenzo[b][1,4]dioxine-5-carboxylic acid, cas is 4442-53-9, it is a common heterocyclic compound, the benzodioxans compound, its synthesis route is as follows.,4442-53-9

Example 45 Preparation of intermediate N- [l- (benzyl)-4-piperidinyl] methyl]-1, 4- benzodioxane-5-carboxamide A suspension of 1, 4-benzodioxan-5-carboxylic acid (1.80 g, 10.0 mmol) and 1,1′- carbonyldiimidazole (1.78 g, 11.0 mmol) in CH3CN (100 ml) was stirred at room temperature for 2 h. 1-Benzyl-4-aminomethylpiperidine (from example 37) (2.04 g, 10.0 mmol) in CH3CN (10 ml) was added to the mixture and stirred overnight at room temperature. The reaction mixture was concentrated in vacuo, added EtOAc (200 ml) and washed with H2O (3 x 50 ml). The organic layer was dried over Na2SO4 and evaporated in vacuo to a solid material. The residue was separated with flash chromatography (Si02, EtOAc: MeOH, 1: 1) to leave the product as a white solid (2.31 g, 63.1 percent). 1H-NMR (200 MHz, CDCl3) : b 7.74 (dd, 1 H), 7.67 (t, 1 H), 7.34-7. 15 (m, 5 H), 7.03-6. 89 (m, 2 H), 4.43-4. 39 (m, 2 H), 4.33-4. 29 (m, 2 H), 3.52 (s, 2 H), 3.37 (t, 2 H), 2.93 (d, 2 H), 2.06-1. 93 (m, 2 H), 1.77-1. 50 (m, 3 H), 1.47-1. 28 (m, 2 H)

With the rapid development of chemical substances, we look forward to future research findings about 2,3-Dihydrobenzo[b][1,4]dioxine-5-carboxylic acid

Reference£º
Patent; BIO-MEDISINSK INNOVASJON AS; WO2005/61483; (2005); A2;,
Benzodioxan
1,4-Benzodioxane | C8H8O2 – PubChem

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.4442-54-0,2,3-Dihydro-1,4-benzodioxine-6-carboxylic acid,as a common compound, the synthetic route is as follows.

Under an argon atmosphere, 4-((2-aminoquinolin-5-yl)oxy)-N-methylpicolinamide prepared in step (9) (500 g, 0.2 mmol) and 1,4-benzodioxane-6-carboxylic acid (61 mg, 0.3 mmol) was dissolved in a solvent of N,N-dimethylformamide (2 mL), N,N-diisopropylethylamine (0.1 mL, 1.0 mmol) and 1-[bis (dimethylamino) methylene-1H-1,2,3-triazole [4,5-b] pyridinium 3-oxide hexafluorophosphate (167 mg, 0.4 mmol). The reaction solution was stirred at 80 ¡ãC for 6 hours, and the completion of the reaction was confirmed by TLC (dichloromethane: methanol = 9: 1). The reaction mixture was poured into water (30 mL) and extracted with ethyl acetate (3 X 20 mL). The extracted organic solvent layer was washed with saturated sodium chloride solution (60 mL), dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to remove the solvent. The concentrate was separated and purified by column chromatography (hexane: ethyl acetate = 2: 1, 1: 1) to obtain the desired compound (28 mg, 36percent yield)., 4442-54-0

The synthetic route of 4442-54-0 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY; KEUM, Gyo Chang; KANG, Soon Bang; PAE, Ae Nim; NAM, Ghil Soo; KIM, Eun Kyeong; SEO, Seon Hui; Ashraf Kareem, MOHAMMAD; LEE, Ju Hyeon; (53 pag.)KR101778938; (2017); B1;,
Benzodioxan
1,4-Benzodioxane | C8H8O2 – PubChem

Name is 2,3-Dihydrobenzo[b][1,4]dioxine-2-carboxylic acid, as a common heterocyclic compound, it belongs to benzodioxans compound, and cas is 3663-80-7, its synthesis route is as follows.,3663-80-7

Method I Ba (1 mmol) and 2,3-dihydrobenzo[b][1,4]dioxin-6-carboxylic acid (or 2,3-dihydrobenzo[b][1,4]dioxin-2-carboxylic acid) (1 mmol) together with EDCI (1.5 mmol) and HOBt (0.05 mmol) in CH2Cl2 (20 mL) were refluxed at room temperature for 10 h. While the reaction completed, the solution was washed with water for three times (30 mL each time). The remaining water layer was extracted by EtOAc for three times (30 mL each time). The organic layers (CH2Cl2 and EtOAc) were combined and then evaporated. The separated solid was crystallized from mixture of DMF and ethanol (9:1) to obtain the corresponding compound as translucent solid. 4.5.20 (3-(4-Bromophenyl)-5-(4-methoxyphenyl)-4,5-dihydro-1H-pyrazol-1-yl)(2,3-dihydrobenzo[b][1,4]dioxin-2-yl)methanone (D5) Yellow crystal, mp: 198-201 ¡ãC. 1H NMR (CDCl3, 300 MHz) delta: 3.17-3.24 (d, J = 17.4 Hz, 1H), 3.67-3.75 (m, 1H), 3.80 (s, 3H), 4.32-4.37 (m, 1H), 4.58-4.62 (d, J = 10.8 Hz, 1H), 5.54-5.58 (m, 2H), 6.82-6.90 (m, 6H), 7.12-7.15 (d, J = 9.0 Hz, 2H), 7.49-7.52 (d, J = 8.1 Hz, 2H), 7.77-7.80 (d, J = 7.8 Hz, 2H). MS (ESI): 493.07 (C25H22BrN2O4, [M+H]+). Anal. Calcd for C25H21BrN2O4: C, 60.86; H, 4.29; Br, 16.20; N, 5.68; O, 12.97. Found: C, 60.68; H, 4.28; N, 5.71.

With the complex challenges of chemical substances, we look forward to future research findings about 2,3-Dihydrobenzo[b][1,4]dioxine-2-carboxylic acid

Reference£º
Article; Yang, Yu-Shun; Li, Qing-Shan; Sun, Shuai; Zhang, Yan-Bin; Wang, Xiao-Liang; Zhang, Fei; Tang, Jian-Feng; Zhu, Hai-Liang; Bioorganic and Medicinal Chemistry; vol. 20; 20; (2012); p. 6048 – 6058;,
Benzodioxan
1,4-Benzodioxane | C8H8O2 – PubChem

Methyl 1,4-Benzodioxan-6-carboxylate, cas is 20197-75-5, it is a common heterocyclic compound, the benzodioxans compound, its synthesis route is as follows.,20197-75-5

Nitric Acid (18 mL) was added dropwise to a solution of 15.0 g (77.3 mmol) of 2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid methyl ester in 45 mL of HOAc. The solution was heated at 60C for 1.5 h. An additional 9 mL of HNO3 was then added and heating was continued for 1.5 h at 70C. The reaction was poured into ice-H2O and the solid product was collected, washed well with H2O and dried. Recrystallization from heptane-toluene yielded 16.8 g of the title compound as yellow crystals: mass spectrum (electron impact, m/e): 239.

20197-75-5 is used more and more widely, we look forward to future research findings about Methyl 1,4-Benzodioxan-6-carboxylate

Reference£º
Patent; Wyeth Holdings Corporation; EP1117659; (2003); B1;,
Benzodioxan
1,4-Benzodioxane | C8H8O2 – PubChem

As a common heterocyclic compound, it belongs to benzodioxans compound, name is 1-(2,3-Dihydrobenzo[b][1,4]dioxin-6-yl)ethanone, and cas is 2879-20-1, its synthesis route is as follows.,2879-20-1

A suspension of NaH (60 %) (8.69 g, 0.224 mol) in DMF (100 ml) was cooled to 0 0C. To this suspension was slowly added l-(2,3-dihydro-l,4-benzodioxin-6-yl)ethanone (20 g, 0.112 mol). The mixture was heated to room temperature and stirred for 2 h. The mixture was then cooled again to 0 0C and CS2 (8.52 g, 0.112 mol) was slowly added. The reaction mixture was stirred for a further 2 h. before being used in the next reaction step without further purification.

With the complex challenges of chemical substances, we look forward to future research findings about 2879-20-1,belong benzodioxans compound

Reference£º
Patent; JANSSEN PHARMACEUTICA NV; WO2009/135944; (2009); A1;,
Benzodioxan
1,4-Benzodioxane | C8H8O2 – PubChem