Phase Transfer Catalyzed Alkylation of 2-(Diethoxyphosphinyl)cyclohexane
作者:Suzanne M. Ruder、Vithalanand R. Kulkarni
DOI:10.1055/s-1993-25972
日期:——
Alkylation of cyclic ß-oxophosphonates using the ion pair extractive-phase transfer catalysis method was studied using 2-(diethoxyphosphinyl) cyclohexanone as the model compound. Unlike related phosphonic acid derivatives, the cyclic ß-oxophosphonates exhibited ambident character under phase transfer conditions when dichloromethane was used as the solvent. Carbon alkylation was most effective when activated and sterically less demanding alkyl halides were utilized.
[2 + 2] Cycloaddition of cyclic vinyl phosphonates with ketenes †
作者:Suzanne M. Ruder、Min Ding
DOI:10.1039/b000014k
日期:——
Highly substituted cyclic β-alkoxyvinyl phosphonates underwent thermal [2+2] cycloaddition with activated ketenes to afford bicyclic phosphonates. Fragmentation of the central polarized bond of this bicyclic system occurred readily upon treatment with zinc in acetic acid, to give rise to ring expanded products. This method provides access to cycloheptane-1,3-diones substituted at the 4-position with