Horner Synthesis of Didehydroamino Acid Derivatives in a Liquid-Liquid Two-Phase System
作者:Pier Giuseppe Ciattini、Enrico Morera、Giorgio Ortar
DOI:10.1055/s-1988-27493
日期:——
Horner olefination of aldehydes 1 with N-acyl-2-(diethoxyphosphoryl) glycin ethyl esters 2 to give didehydroamino acid derivatives 3 can be performed advantageously in a 20% aqueous sodium hydroxide/dichloromethane two-phase system in the absence of any typical phase-transfer catalyst.
Amino Acids and Peptides; XLIII<sup>1</sup>. Dehydroamino Acids; XVIII<sup>2</sup>. Synthesis of Dehydroamino Acids and Amino Acids from<i>N</i>-Acyl-2-(dialkyloxyphosphinyl)-glycin Esters; II
N-Cbz- or N-Tos-α-dehydroamino acid (DHA) and its ester were prepared by the condensation of 2-oxo carboxylic acid or ester with benzyl carbamate or p-toluenesulfonamide. Subsequently, the N-protected DHA and its N-free ester thus obtained were coupled with several L-α-amino acid esters and N-protected (Boc or Cbz)-L-α-amino acid respectively by the usual peptide synthetic methods to give a number
N-Cbz-或N-Tos-α-脱氢氨基酸(DHA)及其酯是通过2-氧代羧酸或酯与氨基甲酸苄酯或对甲苯磺酰胺缩合制备的。随后,将由此获得的 N-保护的 DHA 及其无 N-酯分别与几种 L-α-氨基酸酯和 N-保护的(Boc 或 Cbz)-L-α-氨基酸通过通常的肽合成方法偶联到给出许多不同类型的脱氢二肽。获得的所有新 DHA 和脱氢二肽的构型均显示为 (Z)-几何。