E. Aller et al., N-isocyanotriphenyliminophosphorane; a convenient reagent for the conversion of acyl chlorides into alpha-diazoketones, SYNLETT, (4), 2000, pp. 526-528
Aliphatic, aromatic and vinylic acid chlorides were converted into the corr
esponding alpha-diazoketones in synthetically useful yields by reaction wit
h N-isocyanotriphenyliminophosphorane followed by treatment of the resultin
g N-unsubstituted alpha-ketohydrazidoyl chlorides with triethylamine in the
presence of a catalytic amount of p-toluenesulfonyl chloride.