Chiral synthesis via organoboranes. 25. B-(Z and E)-crotylbis-(2-isocaranyl)boranes as valuable reagents for the asymmetric crotylboration of aldehydes
作者:Herbert C. Brown、Ramnarayan S. Randad
DOI:10.1016/s0040-4020(01)85574-5
日期:——
The asymmetric crotylboration of representative aldehydes, RCHO (R = Me, Et-), with B-[Z and E]-crotylbis(2-isocaranyl)boranes (4 and 5) proceeds with remarkably high enantioselectivity (>94-98% ee) and diastereoselectivity (>99% de) at -78°C in ethyl ether.