A bridged tetrahydrophosphole ylide derived from 9-phenylphosphabicyclo[4.2.1]nonane: a reagent for E-selective Wittig reactions
作者:E. Vedejs、M. J. Peterson
DOI:10.1021/jo00060a001
日期:1993.4
The bicyclic ylide 4 reacts with aldehydes to afford the E-alkenes. Selectivity is 94-6% E for unbranched aldehydes, but the selectivity decreases with increasing alpha-branching. Ylide 4 is the first E-selective, nonstabilized ylide that allows efficient utilization of the P-alkyl substituent.