Condensation of 14-bromodaunorubicin with thiols in methanol, in the presence of potassium carbonate, resulted in the formation of 14-thia analogues of the antitumor antibiotic adriamycin. However, similar condensation of N-(trifluoroacetyl)-l4- iododaunorubicin with thiols invariably led to a redox reaction, with the formation of N- (trifluoroacety1) daunorubicin and disulfides. Accordingly, N-(trifluoroacetyl)-14- ...