Organocatalytic Synthesis of Multiple Substituted Bicyclo[4.4.0]Decalin System
摘要:
An efficient and unprecedented organocatalytic reaction of gamma-nitroketones with alpha,beta-unsaturated aldehydes to give polyfunctionalized [4.4.0] bicyclic skeletons was developed. The diphenylprolinol silyl ether mediated nitro-Michael/Aldol reaction afforded the hexa-substituted decalin carboaldehydes with excellent diastereo- and enantioselectivity (up to > 99:1 dr and > 99% ee) via a formal [4 + 2] carbocyclization process.