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A Ti(Oi‐Pr)4 promoted 5‐ or 6‐endo‐trig cyclisation to make nitrogen heterocycles is presented. The utilisation of HFIP as a key solvent enables the stereoselective preparation of di‐ & tri‐substituted pyrrolidines and piperidines while forming a new C−C bond at the same time. The process is triggered by a cationic intermediate generated from an allylic or benzylic alcohol and leads to the simultaneous...
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