作者:Krystyna Osowska-Pacewicka、Andrzej Zwierzak
DOI:10.1055/s-1990-26921
日期:——
A new procedure for the facile preparation of various vicinal diamines is developed that utilizes diethyl N-(β-bromoalkyl)phosphoramidates 2 easily accessible by ionic addition of diethyl N,N-dibromophosphoramidate (DBPA) to alkenes and cycloalkenes 1. Crude phosphoramidates 2 are readily transformed into the corresponding ammonium ditosylates 5 by sequential azidation, Staudinger reaction with triethyl phosphite, and deprotection by refluxing with p-toluenesulfonic acid in aqueous ethanol. Diamination of cyclohexene and indene proceeds stereospecifically affording cis-1,2-diaminocyclohexane and cis-1,2-diaminoindane, respectively. Open-chain olefins do not react stereospecifically under conventional conditions yielding mixtures of diastereoisomers. Full stereochemical control of azidation can be, however, achieved when β-bromoamine hydrochlorides instead of diethyl N-(β-bromoalkyl)phosphoramidates are used as starting materials for this reaction.
开发了一种轻松制备各种邻位二胺的新程序,该程序利用 N-(β-溴烷基)氨基磷酸二乙酯 2,通过将 N,N-二溴氨基磷酸二乙酯 (DBPA) 离子加成到烯烃和环烯烃 1 上即可轻松获得。粗氨基磷酸酯 2 为通过连续叠氮化、与亚磷酸三乙酯的施陶丁格反应以及通过与对甲苯磺酸在乙醇水溶液中回流来脱保护,很容易转化为相应的二甲苯磺酸铵5。环己烯和茚的二胺化分别立体定向地产生顺式1,2-二氨基环己烷和顺式1,2-二氨基茚满。 开链烯烃在常规条件下不会发生立体有择反应,产生非对映异构体的混合物。然而,当使用β-溴胺盐酸盐代替N-(β-溴烷基)氨基磷酸二乙酯作为该反应的起始原料时,可以实现叠氮化的完全立体化学控制。