Preparation of cysteine adducts by regioselective ring-opening reactions of phenyloxirane
作者:Alena Moulisová、Igor Linhart
DOI:10.1515/hc-2015-0042
日期:2015.4.1
Abstract Regioselective ring-opening reactions of phenyloxirane by protected cysteine are described, which enable the synthesis of pure regioisomeric cysteine adducts required for bioanalytical studies on adducts of protein with styrene. The reaction catalyzed by tris(pentafluorophenyl)borane proceeds regioselectively and stereospecifically to give protected S-(2-hydroxy-1-phenylethyl)cysteine (α-adduct)
摘要 描述了受保护的半胱氨酸对苯基环氧乙烷的区域选择性开环反应,该反应能够合成纯区域异构半胱氨酸加合物,用于对蛋白质与苯乙烯的加合物进行生物分析研究。由三(五氟苯基)硼烷催化的反应以区域选择性和立体特异性进行,得到受保护的 S-(2-羟基-1-苯基乙基)半胱氨酸(α-加合物),在 α-碳上发生构型反转。相比之下,当相同的反应由四烷基氟化铵催化时,主要形成 S-(2-羟基-2-苯基乙基) 半胱氨酸 (β-加合物),并观察到完全外消旋化。