Ytterbium triflate-catalyzed asymmetric hetero Diels-Alder cycloaddition of a 1-thiabuta-1,3-diene with a chiral N-acryloyloxazolidinone dienophile. Diastereoface control by solvents or achiral additives
作者:Takao Saito、Mikako Kawamura、Jun-ichi Nishimura
DOI:10.1016/s0040-4039(97)00520-0
日期:1997.5
Ytterbium triflate [Yb(OTf)3]-catalyzed asymmetric hetero Diels-Alder cycloaddition reaction of 2,4-diphenyl-1-thiabuta-1,3-diene with (S)-N-acryloyl-4-benzyl-1,3-oxazolidin-2-one is described in which the sense of the π-facial selectivity can be controlled by solvents or additives employed without altering the auxiliarychirality for the asymmetric induction.