Inspired by this observation, we hypothesized that a radical version might be possible by using 1,3-bisα-amino radical donor and 1,3-bis radical acceptor (Scheme 1, B), radical donor and acceptor being defined and represented according to Curran's proposal in his seminal article on retrosynthetic planning of radical reactions. To the best of our knowledge, this type of radical [3+3]-annulation has not yet been reported. Scheme 1. Retrosynthetic analysis of tropane alkaloids according to their biosynthesis and to Robinson synthesis (A) as a source of inspiration for a radical retrosynthetic analysis (B)