An efficient approach to chiral nonracemic trans- and cis-decalin scaffolds for drimane and labdane synthesis
作者:Gian Piero Pollini、Anna Bianchi、Alberto Casolari、Carmela De Risi、Vinicio Zanirato、Valerio Bertolasi
DOI:10.1016/j.tetasy.2004.07.064
日期:2004.10
Optically active trans- and cis-ring junction decalinic intermediates, which represent useful precursors for the synthesis of more complex natural targets, have been conveniently prepared starting from the β-ketoester 2 obtained by standard chemistry from β-ionone and dimethyl carbonate. The chiral auxiliary (−)-menthol, easily attached to 2 through DMAP-catalyzed transesterification, allowed a clean separation