Synthesis of mixed phosphonate diester analogues of dipeptides using BOP or PyBOP reagents
作者:Jean-Marc Campagne、Jacques Coste、Patrick Jouin
DOI:10.1016/s0040-4039(00)61690-8
日期:1993.10
Mixed phosphonate diesters of a N-protected α-amino phosphonic acid are prepared from phosphonatemonoestersusing BOP or PyBOP as activating agent. This reaction proceeds without racemisation.
Synthesis and Comparative Study on the Reactivity of Peptidyl-Type Phosphinic Esters: Intramolecular Effects in the Alkaline and Acidic Cleavage of Methyl β-Carboxyphosphinates
Using the phosphinic analogue of Cbz-Phe-Gly-OEt 1a as a template for this study, several phosphinic esters (2a-g) were prepared, employing an efficient method for each case. The reactivity of these derivatives under conventional deprotection conditions was studied, and the results are listed comparatively. The effect of steric hindrance as well as the contribution of neighboring groups in the rate
structure of haptens and the esterolytic activities of antibodies was investigated. We synthesized two phenylalanine analogs, the negatively charged phosphonatederivative 1 and the neutral phosphonamidate derivative 2. Seventeen out of 41 monoclonal antibodies generated against the hapten 1 hydrolyzed the relevant phenylalanine ester R-12. On the contrary, none of 27 monoclonal antibodies generated against
Oxalyl chloride-mediated preparation of phosphonochloridates allowed the improvement of the synthesis of phosphonamidate peptides, particularly if AgCN was used as catalyst or upon conversion of the chloridate into the 7-aza-1-hydroxybenzotriazole ester.