Conjugate addition of chloride to α,β-unsaturated chiral imides promoted by BCl3-derivatives. Part II
作者:Giuliana Cardillo、Emanuela Di Martino、Luca Gentilucci、Claudia Tomasini、Laura Tomasoni
DOI:10.1016/0957-4166(95)00255-n
日期:1995.8
The diastereoselective hydrochlorination of alpha,beta-unsaturated chiral imides by reaction with BCl(2)OR or BCl(OR)(2) type reagents is described. Complete diastereoselectivity is achieved through the use of new oxazolidin-2-ones ad hoc prepared for this purpose from (S)-tryptophan. An hypothesis on the donor-acceptor interactions, between the substrate and the Lewis acids, that drive the attack of the chloride preferentially to one face of the alkenoyl chain is reported.