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.
代表性醛RCHO(R = Me,Et-)与B- [Z和E ]-巴豆基双(2-异戊基)硼烷(4和5)的不对称巴豆基硼化进行过程中具有很高的对映选择性(> 94-98%ee )和非对映选择性(> 99%de)在-78°C下的乙醚溶液中。