Catalyst-dependent chemoselective insertion of diazoalkanes into the N–H/C–H/O–H/C–O bonds of 2-hydroxybenzothiazoles

Chemoselective insertions of diazoalkanes into 2-hydroxybenzothiazoles are achieved using B(C 6 F 5 ) 3 , Rh 2 (OAc) 4 or TfOH as a catalyst, illustrating the complementary nature of Lewis acid, transition metal and Brønsted acid catalyses.