Synthesis of dehydroabietane-derived sulfonamides with fragments of L-amino acid esters and hydrazides

Abstract

Ethyl ester of 12-chlorosulfodehydroabietic acid, when reacted with the methyl esters of glycine, methionine, leucine, glutamic acid, tyrosine, proline, histidine, for the first time yielded the corresponding sulfonamides, the ester group (-COOMe) of which was selectively transferred to the hydrazide (-COONHNH2) without affecting the ethyl group bounded with the dehydroabietic acid fragment. In the case of glutamic acid, the corresponding dihydrazides were obtained. The reaction of 12-chlorosulfodehydroabietic acid ethyl ester with cystine dimethyl ester led to the selective formation of bis-sulfonamide, while carrying out the same reaction in an acetone-contained solution was accompanied by the cleavage of the disulfide bond of the cystine fragment to give thioketal. The obtained bis-sulfonamide and thioketal were oxidized with chlorine dioxide to afford in both cases sulfochloride.