factor-active drugs. The use of the piperidine catalyst and no catalyst showed very high cis-stereoselectivity (cis/trans = 10/1—50/1) during the reaction. On the other hand, the trans-selective reaction was promoted by Ti(O-i-Bu)4 and Al(O-s-Bu)3 catalysts (cis/trans = 1/8—1/25). Both reactions were conducted with higher cis- and trans-selectivities as compared with those of the alkyl 2-mercaptoalkanoates under
trans‐stereocomplementary synthetic manner. cis‐Selective cyclo‐condensation proceeded between 2‐sulfanylpropanoic acid (thiolactic acid) and an imine derived from 4‐bromobenzaldehyde and methylamine, whereas Ti(OiPr)4 and Ti(OiBu)4‐promoted trans‐selective cyclo‐condensation proceeded between benzyl 2‐sulfanylpropanoate and the imine. The obtained cis‐ and trans‐2‐(p‐bromophenyl)‐5‐methylthiazolidin‐4‐ones
新颖顺-和反式-2-(p溴苯基)-5- methylthiazolidin -4-酮,小号,Ñ含杂环化合物,是提供了一种在CIS -stereocomplementary和反式-stereocomplementary合成方式。顺式-选择性环缩合反应在2-硫烷基丙酸(硫代乳酸)与由4-溴苯甲醛和甲胺衍生的亚胺之间进行,而Ti(O i Pr)4和Ti(O i Bu)4则促进了反式-选择性环缩合反应。 2-磺硫基丙酸苄酯与亚胺之间的缩合反应。获得的顺式-和反式- 2-(p溴苯基)-5- methylthiazolidin -4-酮被成功地转换为利用铃木-宫浦和宫浦-石山横2-(3-呋喃基)苯基衍生物和双(频哪醇基)二硼烷衍生物偶联反应分别以增强作用方式进行。