The Enantioselective Synthesis of (+)-Estradiol from 1,3-Dihydrobenzo[c]thiophene-2,2-dioxide by Successive Thermal SO2-Extrusion and Cycloaddition Reactions. Preliminary communication
作者:Wolfgang Oppolzer、David Anthony Roberts
DOI:10.1002/hlca.19800630638
日期:1980.9.17
The optically pure steroid (+)-15 has been synthesized from the easily accessible (+)-carboxylic acid 11 by a sequence of 7 steps in 50% overall yield. The key steps are the regioselective deprotonation/alkylation 7+13 14 and the thermal SO2-extrusion/cycloaddition 14 15(Scheme 3). The compound (+)-15 has been readily converted to the naturally occurring (+)-estradiol (17) in 60% yield.
光学纯的类固醇(+)- 15由易于获得的(+)-羧酸11经7个步骤合成,总产率为50%。关键步骤是区域选择性去质子化/烷基化7 + 13 14和热SO 2-挤出/环加成14 15 (方案3)。化合物(+)- 15已容易以60%的产率转化为天然存在的(+)-雌二醇(17)。