反应详情

To a solution of (2R,6S,13aS,14aR,16aS,Z)-ethyl 6-(tert-butoxycarbonylamino)-5,16-dioxo-2-(phenanthridin-6-yloxy)-1,2,3,5,6,7,8,9,10,11,13a,14,14a,15,16,16a-hexadecahydrocyclopropa[e]pyrrolo [1,2-a][1,4]diazacyclopentadecine-14a-carboxylate (Example 18a, 3.2 g, 4.77 mmol) in tetrahydrofuran (41.5 ml) at rt with a water bath was added dropwise borane tetrahydrofuran complex (1 M in tetrahydrofuran, 14.3 ml, 14.3 mmol) and stirred at room temperature for 1 h. The mixture was cooled to 0° C. and sodium hydroxide (11.5 ml, 28.6 mmol) was added dropwise followed by hydrogen peroxide (4.0 ml, 43 mmol), and the reaction mixture stirred for 1.5 h at 0° C. The mixture was diluted with ethyl acetate and water, and the organic layer was washed with saturated aqueous sodium chloride solution. The resulting solid was purified via flash chromatography on silica gel (5% methanol in dichloromethane) to provide the title compound (2R,6S,13aS,14aR,16aS)-ethyl 6-(tert-butoxycarbonylamino)-12-hydroxy-5,16-dioxo-2-(phenanthridin-6-yloxy)octadecahydrocyclopropa[e]pyrrolo[1,2-a][1,4]diazacyclopentadecine-14a-carboxylate (1.06 g, 1.539 mmol, 32.3% yield). The α-hydroxy analog (2R,6S,13R,13aR,14aR,16aS)-ethyl 6-(tert-butoxycarbonylamino)-13-hydroxy-5,16-dioxo-2-(phenanthridin-6-yloxy)octadecahydrocyclopropa[e]pyrrolo [1,2-a][1,4]diazacyclopentadecine-14a-carboxylate (0.7 g, 21% yield) was also isolated.

1. temperatureThe mixture was cooled to 0° C.
2. stirringthe reaction mixture stirred for 1.5 h at 0° C
3. washthe organic layer was washed with saturated aqueous sodium chloride solution
4. customThe resulting solid was purified via flash chromatography on silica gel (5% methanol in dichloromethane)