A new simple protocol for the direct synthesis of phosphonodipeptides from
N-protected amino acids, diethyl 1-azidoalkylphosphonates and tertiary alky
l phosphine (Bu3P, Me3P) was developed. The method is general and the coupl
ing occurred with good yield (42-97%). Depending on the phosphine used and/
or mechanism operating during the condensation, the reaction can be accompl
ished at room temperature, or on heating in toluene. (C) 2000 Elsevier Scie
nce Ltd. All rights reserved.