반응 #797068

반응 방정식

methanesulfonic acid 4-tert-butyl-cyclohexyl ester

(R)-4-(6-Hydroxy-5-iodo-quinazolin-2-yl)-4-methyl-oxazolidin-2-one

methanesulfonic acid 4-tert-butyl-cyclohexyl ester

cesium carbonate

tert-butyl alcohol

2-butanone

→

desired product

수율 94.0%

(R)-4-(6-(trans-4-tert-Butylcyclohexyloxy)-5-iodoquinazolin-2-yl)-4-methyloxazolidin-2-one

수율 94.0%

용매

DCM

반응 조건

후처리

1. 1
   온도the mixture was heated at 80° C. for an additional for 1 hour
2. 2
   기타LC/MS indicated that reaction
3. 3
   기타Removal of solvents
4. 4
   기타gave a solid mixture, which
5. 5
   여과filtered
6. 6
   세척The filtrate was then washed with water, brine
7. 7
   건조dried over Na2SO4
8. 8
   기타The crude mixture was then purified via chromatography (SiO2, 24 gm, 0-100% ethyl acetate/hexanes)

실험 절차

(R)-4-(6-Hydroxy-5-iodo-quinazolin-2-yl)-4-methyl-oxazolidin-2-one (350.0 mg, 0.0009431 mol), methanesulfonic acid 4-tert-butyl-cyclohexyl ester (884.0 mg, 0.003772 mol) and cesium carbonate (921.8 mg, 0.002829 mol) were dissolved in a mixture of tert-butyl alcohol (19.9 mL, 0.208 mol) and 2-butanone (6.6 mL, 0.074 mol). The reaction mixture was heated at 80° C. for 1 hour (MW), an additional methanesulfonic acid 4-tert-butyl-cyclohexyl ester (500 mg) was added, and the mixture was heated at 80° C. for an additional for 1 hour. LC/MS indicated that reaction was completed. Removal of solvents gave a solid mixture, which was treated with DCM and filtered. The filtrate was then washed with water, brine and dried over Na2SO4. The crude mixture was then purified via chromatography (SiO2, 24 gm, 0-100% ethyl acetate/hexanes) to give 451 mg desired product (94%). 1H NMR (CHLOROFORM-d) δ: 9.55 (s, 1H), 7.94 (d, J=9.3 Hz, 1H), 7.61 (d, J=9.3 Hz, 1H), 6.07 (s, 1H), 5.16 (d, J=8.8 Hz, 1H), 4.50 (d, J=8.8 Hz, 1H), 4.24-4.42 (m, 1H), 2.24 (d, J=12.0 Hz, 2H), 1.92 (d, J=9.5 Hz, 2H), 1.76 (s, 3H), 1.63 (d, J=11.3 Hz, 1H), 1.22-1.39 (m, 2H), 1.15 (br. s., 2H), 0.81-0.98 (m, 9H). MS (M+1): 510.10.

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