P-chiral thioxophosphoranesulfenyl chlorides RR'P(S)SCL. A unique stereochemical probe to study nucleophilic displacement at a dicoordinate sulfur center
作者:Lech Łuczak、Andrzej Łopusiński、Jan Michalski
DOI:10.1016/s0040-4020(98)00529-8
日期:1998.8
react with secondary amines such as morpholine or dicyclohexyl amine. All these displacement reactions proceed with almost complete stereochemical integrity at the phosphorus atom. These abservations support a synchronous mechanism of bond breaking and bond formation during nucleophilic displacement at the dicoordinate sulfur atom. The same can be said about the reaction of sulfenamides 9a,b,c with hydrogen
通过使用2Me 3 SiCl + 2EtOH作为选择的试剂的新方法,从P-手性亚磺酰胺9a,b,c开发了P-手性亚硫酰氯6a,b的立体有择合成。的sulfenylamides 9A,B,C是由P-手性氢phosphinothioate的立体有择反应来制备任8A与aminosulfenyl卤化物或非对映体的混合物的分离9A,B,C通过结晶。对-手性氯化物6a,b使它们与仲胺如吗啉或二环己基胺反应。所有这些置换反应都在磷原子上以几乎完全的立体化学完整性进行。这些观察结果支持在双配位硫原子上的亲核取代过程中键断裂和键形成的同步机制。关于亚磺酰胺9a,b,c与氯化氢的反应也可以说相同。