Preparation of α-(N-trimethylsilyl)imino esters and their use in the synthesis of α-amino esters and 2-alkoxycarbonylimidazol-4(2H)-ones
作者:Yoshihiko Matsuda、Shigeo Tanimoto、Tadashi Okamoto、Syed Mashhood Ali
DOI:10.1039/p19890000279
日期:——
reaction of α-keto esters with lithium 1,1,1,3,3,3-hexamethyldisilazanide afforded α-(N-trimethylsilyl)imino esters in good yields, which were reduced to the corresponding α-amino esters by reducing agents such as NaBH3CN. α-(N-Trimethylsilyl)imino esters were treated with methanol to afford 2-alkoxycarbonylimidazole-4(2H)-ones via dimerization of the intermediate α-imino esters.
α-酮酯与1,1,1,3,3,3-六甲基二硅氮杂环丙烷锂的反应以良好的收率得到了α-(N-三甲基甲硅烷基)亚氨基酯,通过还原剂将其还原为相应的α-氨基酯。作为NaBH 3 CN。α-(N-三甲基甲硅烷基)亚氨基酯用甲醇处理,通过中间α-亚氨基酯的二聚作用得到2-烷氧基羰基咪唑-4(2H)-酮。