Expedient Copper-Free One-Pot Alkynylation–Cyclization Sequence for the Preparation of 2-Substituted 7-Azaindoles
摘要:
2-Substituted 7-azaindoles are rapidly and efficiently prepared in a one-pot copper-free alkynylation-cyclization sequence starting from 2-aminopyridyl halides and terminal alkynes. Most importantly the amino nitrogen atom neither requires activation nor protection throughout the sequence.