中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | spiro[((17R)-16β-bromo-3-methoxyestra-1,3,5(10)-triene)-17,2'-(5'-methylfuran-3'(2'H)-one)] | 218440-90-5 | C23H27BrO3 | 431.37 |
Synthesis of 17β-isoxazolyl steroids and their transformations into the corresponding spiro[steroid-17,2'-furanone]s are described. The reaction sequence consists of the 1,3-dipolar cycloaddition of a nitrile oxide to mestrenol, dehydration, epoxidation or dihydroxylation, cleavage of the isoxazole moiety and cyclization of intermediate enamino ketones.