作者:Dianne Cooper、Stuart Trippett
DOI:10.1039/p19810002127
日期:——
α-Hydroxyalk-2-enylphosphonates undergo Claisen orthoester rearrangement on heating with orthoesters, and their arylsulphenates undergo [2,3]-sigmatropic rearrangement to give 3-arylsulphinylalk-1-enylphosphonates. The addition of allyloxide anion to the central carbon of the allene Me2CCCHP(O)(OEt)2 is followed by rapid Claisen rearrangement of the resulting allylic carbanion to give the two possible
与原酸酯一起加热时,α-羟基烷-2-烯基膦酸酯会发生Claisen原酸酯重排,其芳基磺酸酯会发生[2,3]-σ重排,从而生成3-芳基亚磺酰基烷基-1-烯基膦酸酯。在烯丙基Me 2 C C CHP(O)(OEt)2的中心碳上添加烯丙氧基阴离子后,对所得的烯丙基碳负离子进行快速克莱森重排,得到两种可能的β-酮烷基膦酸酯。已制备出通式为R 1 R 2 C CH [CH 2 ] n CR 3 C CHP(O)(OEt)2的烯丙基膦酸酯:当R 1 = R 2时= H,R 3= Me,且n= 2,发生对映体重排以得到异构二烯;α= H,R 3= Me,n= 2。当R 1,R 2,R 3= Me且n= 0时,[1,5]氢化物转移得到三烯,然后环化成环己二烯;当R 1 = Me,R 2 = H,R 3 = H或Me且n = 0时,二烯组分可用于Diels–Alder反应。