Efficient chiral poisoning of racemic titanium catalysts for the asymmetric chloral-ene reaction
作者:J.W. Faller、X. Liu
DOI:10.1016/0040-4039(96)00643-0
日期:1996.5
A BINOL catalyst can be poisoned with an inactive enantiopure catalyst, diisopropyl , to yield an effective catalyst for the asymmetric ene reaction with chloral. In some cases the ee's are greater than those observed with catalysts prepared from enantiopure BINOL.
Regioselective ring cleavage of chiral β-trichloromethyl-β-propiolactone with organoaluminum compounds for the synthesis of optically active intermediates
A novel alkylating ring cleavage reaction of enantiomerically pure β-trichloromethyl-β-propiolactone as a chiral building block with organoaluminum compounds provided ring-opened products with a chiral trichloromethylcarbinol moiety. A product was demonstrated to be used as an effective chiral synthon for the synthesis of chiral bioactive derivatives such as ipsdienol and sodium cilastatin.