A general method for the one-pot synthesis of substituted 3-(tert-butyldimethylsilyloxy)indoles via hydrohydrazination of alkynes and subsequent Fischer indole synthesis has been developed. For the first time titanium-catalyzed hydroaminations of propargyl alcohol derivatives are shown.
We present a PPh3/DDQ-mediated regiospecific selectiveN-functionalization of arylhydrazines with primary benzylic alcohols and aryl carboxylic acids for the synthesis of N1-benzyl arylhydrazines and N2-acyl arylhydrazines, respectively. This metal- and base-free approach features very short reaction times (about 10 min), broad substrate scope, good functional group tolerance, and mild reaction conditions