Iminiumions derived from a condensation of glyoxal and N-methyl (R)-phenylglycinol react with allylic silanes (trimethylallyl and trimethylmethallylsilanes) and enoxysilanes (2-trimethylsilyloxypropene and 2-trimethylsilyloxystyrene). These reactions proceed in a totally stereoselective way as evidenced by a chemical correlation and an X-Ray analysis of a compound related to both series of experiments
Asymmetric synthesis of N-methyl-α-amino esters from a glyoxal derived chiral heterocycle
作者:C. Agami、F. Couty、B. Prince、C. Puchot
DOI:10.1016/s0040-4020(01)87103-9
日期:1991.1
The reaction between a chiral template derived from glyoxal with organometallic reagents leads ultimately to the opticallyactive title compounds. The stereochemical outcome of the key-step which involves substitution of a thiophenol group depends on the organometallic: predominantly inversion with alkyl copper or complete retention with alkyl zinc halides. The stereodirecting effect of an allylic