四肽酪氨酸激酶抑制剂。对映选择性合成对羟基甲基- l-苯丙氨酸,结合成四肽,随后精化成对(R, s -羟基磷甲乙酯)- l-苯丙氨酸。

M H Kim, J H Lai, D G Hangauer
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引用次数: 0

摘要

通过手性相转移催化烷基化反应,制备了对羟基甲基-L-苯丙氨酸的对映体,其L/D比为4/1。该氨基酸偶联到p56(1)ck酪氨酸激酶底物Ac-Leu-Pro-Tyr-Ala-NHCH3中作为Tyr的替代品,随后可以被加工成各种潜在的酪氨酸激酶抑制剂设计,其一般结构为Ac-Leu-Pro-AA-Ala-NHCH3,其中AA是一种非天然氨基酸。在与该序列的L-Ala-NHCH3偶联后,污染的D对映体很容易被去除。通过Ac-Leu-Pro-AA-Ala-NHCH3的合成,说明了对羟甲基功能在导致各种抑制剂设计的有效合成策略中的效用,其中AA是对(R, s -羟基磷甲乙基)- l -苯丙氨酸。
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Tetrapeptide tyrosine kinase inhibitors. Enantioselective synthesis of p-hydroxymethyl-L-phenylalanine, incorporation into a tetrapeptide, and subsequent elaboration into p-(R,S-hydroxyphosphonomethyl)-L-phenylalanine.

A convenient enantioselective synthesis of p-hydroxymethyl-L-phenylalanine was developed which produces a 4/1 ratio of L/D enantiomers resulting from a chiral phase-transfer-catalyzed alkylation. This amino acid was coupled into the p56(1)ck tyrosine kinase substrate Ac-Leu-Pro-Tyr-Ala-NHCH3 as a replacement for Tyr and can subsequently be elaborated into a variety of potential tyrosine kinase inhibitor designs of general structure Ac-Leu-Pro-AA-Ala-NHCH3, wherein AA is an unnatural amino acid. The contaminating D enantiomer was readily removed after coupling to L-Ala-NHCH3 of this sequence. The utility of the p-hydroxymethyl functionality in an efficient divergent synthetic strategy leading to various inhibitor designs is illustrated with the synthesis of Ac-Leu-Pro-AA-Ala-NHCH3, wherein AA is p-(R,S-hydroxyphosphonomethyl)-L-phenylalanine.

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