Stereospecific Synthesis of<i>N</i>-(Diphenylmethylene)-α,β-didehydroamino Acid Methyl Esters from β-Hydroxy-α-amino Acids
作者:Cesarino Balsamini、Ermanno Duranti、Leonardo Mariani、Americo Salvatori、Gilberto Spadoni
DOI:10.1055/s-1990-27012
日期:——
N-(Diphenylmethylene)-α,β-didehydroamino acid methyl esters 2b-d are prepared with absolute geometric selectivity from inexpensive β-hydroxyamino acids through the intermediates N-(diphenylmethylene)- β-hydroxyamino acid methyl esters 1b-d. Besides, an easy conversion from E isomers to the corresponding Z isomers was performed, thus avoiding the use of the uncommon allo-β-hydroxyamino acids as starting materials.
通过中间体 N-(二苯基亚甲基)-δ,δ-二羟基氨基酸甲酯 1b-d 以绝对几何选择性从廉价的δ-羟基氨基酸制备出 N-(二苯基亚甲基)-δ-二羟基氨基酸甲酯 2b-d。此外,还可以轻松地从 E 异构体转化为相应的 Z 异构体,从而避免了使用不常见的δ-²-羟基氨基酸作为起始原料。