Nucleophilic cleavage of 1-oxo-2,8-disubstituted-2,5,8-triaza-1λ5-phosphabicyclo[3.3.0]octanes: a new route to eight- and five-membered heterocyclic systems
作者:Zhengjie He、Susan Laurens、Xavier Y. Mbianda、Agnes M. Modro、Tomasz A. Modro
DOI:10.1039/a903835c
日期:——
8-triaza-1λ5-phosphabicyclo[3.3.0]octanes 1 have been prepared and the nucleophilic cleavage of one of their P–N bonds has been studied. The acid-catalyzed alcoholysis involves in each case the cleavage of the P–N(5) bond, yielding the eight-membered monocyclic diamides 2. In the base-catalyzed reaction, the N(2),N(8)-dialkyl substituted substrates 1 yielded the same products 2, while for the N(2),N(8)-diaryl derivatives