Dehydrooligopeptides. II. The Synthesis of Dehydrodehydrodipeptides by Direct Coupling and Base-catalyzed β-Elimination
作者:Chung-gi Shin、Yasuchika Yonezawa、Masatoshi Takahashi、Juji Yoshimura
DOI:10.1246/bcsj.54.1132
日期:1981.4
dehydrodipeptides with a hydroxyl group, obtained by the coupling of 1 with a serine or threonine ester, and that of N-protected serine or threonine with 2, followed by mesylation and subsequent base-catalyzed β-elimination gave a number of 7 substances in good yields. The configurational structures of 7 obtained by both direct condensation and elimination were found to have (Z,Z)-geometry.
N-保护的α-脱氢氨基酸(1)和无N-游离的α-脱氢氨基酸酯(2)通过酰氯法直接偶联得到几种脱氢脱氢二肽(7)。此外,通过 1 与丝氨酸或苏氨酸酯偶联获得的两种具有羟基的脱氢二肽,以及 N-保护的丝氨酸或苏氨酸与 2 偶联,然后甲磺酰化和随后的碱催化β-消除得到7 种物质产量良好。通过直接缩合和消除获得的7的构型结构被发现具有(Z,Z)-几何。