Synthetic Studies on Thiothreonines. II
作者:Mitsuhiro Kinoshita、Sumio Umezawa
DOI:10.1246/bcsj.24.239
日期:1951.5
chlorobutyrate, m. p. 84.5-86.5°, in a yield of 57%. On the other hand, chlorination with phosphorus pentachloride in chloroform gave the higher-melting isomer, m. p. 99-100°. (2) Two isomers of α-benzamido-β-benzylmercaptobutyric acid (derivatives of thiothreonine A and B) were synthesised. The chlorine atom of ethyl DL-α-benzamido-β-chlorobutyrate could be replaced by a sulfhydryl group by the action
(1) DL-N-苯甲酰基异苏氨酸乙酯与亚硫酰氯在苯中在吡啶存在下氯化得到低熔点异构体乙基-DL-α-苯甲酰氨基-β-氯丁酸酯,熔点84.5-86.5°,产率57%。另一方面,在氯仿中用五氯化磷氯化得到更高熔点的异构体,mp 99-100°。(2)合成了α-苯甲酰氨基-β-苄基巯基丁酸的两种异构体(硫苏氨酸A和B的衍生物)。DL-α-苯甲酰氨基-β-氯丁酸乙酯的氯原子在苄硫醇的作用下可以被巯基取代。描述了不同溶剂对这种置换反应的显着影响。