Studies on the synthesis of the decahydro-<i>as</i>-indacene ring system of (-)-spinosyn A via transannular Diels-Alder reactions of substituted (<i>E,E,E</i>)-cyclododeca-1,6,8-trienes
作者:Scott A Frank、Andrea B Works、William R Roush
DOI:10.1139/v00-045
日期:2000.6.1
Stereoselective syntheses of decahydro-as-indacenes 31 and 54 are reported. The key features of our syntheses of 31 and 54 are the tandem Ireland-Claisen ring contraction of lactones 29 and 38 followed by the transannular Diels-Alder cyclization of cyclododecatrienes 30 and 35. Transition state modeling of both the transannular Diels-Alder reaction and the Ireland-Claisen ring contraction using PCModel