PAUSON-KHAND REACTION;
INTRAMOLECULAR;
METHYLENECYCLOPROPANES;
DOUBLE BOND ACTIVATION IN;
SPIRO(CYCLOPROPANE-1,4'-BICYCLO[3.3.0]OCT-1-EN-3-ONES) ENANTIOMERICALLY PURE COMPOUNDS;
STEREOSELECTION;
D O I:
10.1016/S0040-4039(00)73225-4
中图分类号:
O62 [有机化学];
学科分类号:
070303 ;
081704 ;
摘要:
Intramolecular Pauson-Khand reactions of 1,6-enynes 3a-c with a methylenecyclopropane terminator and a chiral acetal moiety adjacent to the triple bond gave spiro{cyclopropane-1,4'-bicyclo[3.3.0]oct-1-en-3-ones} 5a-c in good yields with a diastereoselectivity of up to 6.4:1. The major diastereomer of 5b was converted to enantiomerically pure bicyclo[3.3.0]octane-3,8-dione 8, which showed a negative peak at 287 nm in the CD curve, consistent with an assumed (5R) configuration.