Abstract
Factors influencing the reaction yields and formation of the side products during coupling of N-carbobenzoxyamino acids with dialkyl or diphenyl aminoalkylphosphonates, by means of mixed anhydride procedure, were evaluated. The recommended procedure, arising from these studies, involves the use of chloroform/ethyl chloroformate/triethylamine system and delicate warming of the reaction mixture during the coupling step.
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