The synthesis of alkenes via epi-phosphonium species: 2. A phosphorus Ramberg-Bäcklund reaction
作者:Nicholas J. Lawrence、Faiz Muhammad
DOI:10.1016/s0040-4020(98)00960-0
日期:1998.12
bromide by the action of amine bases. A series of stilbenes was synthesised by the action of N-bromosuccinimide and 2,2,6,6-tetramethylpiperidine directly upon dibenzyldiphenylphosphonium salts. The reaction, essentially a phosphonium analogue of the Ramberg-Bäcklund displays cis selectivity. The dibenzyldiphenylphosphonium salts were prepared by the one pot polymethylhydrosiloxane/titanium(IV) isopropoxide
可以通过胺碱的作用从(α-溴苄基)苄基二苯基phenyl溴化物以Z-选择性合成二苯乙烯。通过N-溴代琥珀酰亚胺和2,2,6,6-四甲基哌啶直接作用于二苄基二苯基phosph盐,合成了一系列对苯二酚。该反应基本上是Ramberg-Bäcklund的phospho类似物,具有顺式选择性。通过一锅的聚甲基氢硅氧烷/异丙醇钛(IV)介导的苄基二苯基膦氧化物的还原/烷基化来制备二苄基二苯基phenyl盐。