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A phosphetane catalyzes deoxygenative condensation of α-keto esters and carboxylic acids via P(III)/P(V)═O redox cycling.

Zhao, Wei; Yan, Patrick K; Radosevich, Alexander T.
J Am Chem Soc; 137(2): 616-9, 2015 Jan 21.
Artigo em Inglês | MEDLINE | ID: mdl-25564133
A small-ring phosphacycle is found to catalyze the deoxygenative condensation of α-keto esters and carboxylic acids. The reaction provides a chemoselective catalytic synthesis of α-acyloxy ester products with good functional group compatibility. Based on both stoichiometric and catalytic mechanistic experiments, the reaction is proposed to proceed via catalytic P(III)/P(V)═O cycling. The importance of ring strain in the phosphacyclic catalyst is substantiated by an observed temperature-dependent product selectivity effect. The results point to an inherent distinction in design criteria for organophosphorus-based catalysts operating via P(III)/P(V)═O redox cycling as opposed to Lewis base (nucleophilic) catalysis.
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