Optimisation of enantioselectivity for the chiral base-mediated rearrangement of bis-protected meso-4,5-dihydroxycyclohexene oxides: asymmetric synthesis of 4-deoxyconduritols and conduritol F
作者:Simon E de Sousa、Peter O'Brien、Christopher D Pilgram
DOI:10.1016/s0040-4020(02)00370-8
日期:2002.6
based on diastereoselective epoxidation of a cyclohexene followed by chiral lithium amide-mediated epoxide rearrangement has been used to synthesise an allylic alcoholbuildingblock of >95% ee. The key step is the enantioselective rearrangement of a bis-protected meso-4,5-dihydroxycyclohexene oxide. A range of protecting groups and chiral base structures were surveyed in order to find the optimum protocol
A new strategy towards the synthesis of phenanthridone alkaloids has been reported through the synthesis of (+)-2,7-dideoxypancratistatin from D-(−)-quinic acid employing PET initiated carbocyclization of an electron rich aromatics by silylenol ether as a key step.
报道了一种合成菲啶酮生物碱的新策略,通过使用 PET 引发的硅烯醇醚对富电子芳族化合物的碳环化作用,从 D-(−)-奎尼酸合成 (+)-2,7-双脱氧pancratistatin 作为关键步骤。
O'Brien, Peter; Poumellec, Pierre, Journal of the Chemical Society. Perkin transactions I, 1998, # 15, p. 2435 - 2441