Preparation of, and alkylation of enolate anions with, dimethyl 3-bromo-2 ethoxypropenylphosphonate. An efficient, convergent synthesis of 2-cyclo-penten-1-ones
作者:Edward Piers、Brian Abeysekera、John R. Scheffer
DOI:10.1016/s0040-4039(01)95384-5
日期:1979.1
The alkylation of enolate anions with dimethyl 3-bromo-2-ethoxypropenylphosphonate, followed by acid hydrolysis of the resultant products, affords diketo phosphonate compounds which can be cyclized efficiently to give the corresponding 2-cyclopenten-1-ones. This overall five-membered ring annelation process can be carried out without affecting acid-labile functional groups (e.g. ketal) in the enolate
用3-溴-2-乙氧基丙烯基膦酸二甲酯对烯醇根阴离子进行烷基化,然后酸水解所得产物,得到二酮膦酸酯化合物,其可以有效地环化得到相应的2-环戊烯-1-酮。可以进行整个五元环成环过程,而不会影响烯醇化物底物中的酸不稳定官能团(例如缩酮)。