作者:Christopher J. Moody、Elizabeth Swann、Christopher J. Moody、Leigh Ferris、David Haigh
DOI:10.1039/a706658i
日期:——
A new approach to the synthesis of dipeptides is described based on the formation of the NHCHR1CONH–CHR2CO bond by carbenoid N–H insertion, rather than the formation of the peptide bond itself.
triethyl diazophosphonoacetate catalysed by rhodium(II) acetate in the presence of N-protected amino acid amides 8 gives the phosphonates 9. Subsequent Wadsworth-Emmons reaction of 9 with aldehydes in the presence of DBU gives dehydro dipeptides 10. The reaction has been extended to a simple two-step procedure, without the isolation of the intermediate phosphonate, for conversion of a range of amino acid