Stereocontrolled Asymmetric Synthesis of α-Hydroxy-β-amino Acids. A Stereodivergent Approach
作者:Yutaka Aoyagi、Rajendra P. Jain、Robert M. Williams
DOI:10.1021/ja0042332
日期:2001.4.1
The stereocontrolled asymmetric synthesis of alpha-hydroxy-beta-amino acids has been investigated via the Lewis acid-promoted cyanation of (5R,6S)-2-acetoxy-4-(benzyloxycarbonyl)-5,6-diphenyl-2,3,5,6-tetrahydro-4H-1,4-oxazines with trimethylsilyl cyanide. Base-catalyzed hydrolysis of the resulting cyano compounds proceeds with excellent stereoselectivity, providing access to diastereomerically pure
通过路易斯酸促进的 (5R,6S)-2-acetoxy-4-(benzyloxycarbonyl)-5,6-diphenyl-2,3 氰化,研究了 α-羟基-β-氨基酸的立体控制不对称合成, 5,6-四氢-4H-1,4-恶嗪与三甲基甲硅烷基氰化物。所得氰基化合物的碱催化水解具有优异的立体选择性,可提供非对映异构纯的恶嗪-2-羧酸,这些酸很容易转化为 α-羟基-β-氨基酸异苏氨酸和去甲 C-statine 的每种对映异构体。