Lord of the rings! [3.1.0] bicyclic ring systems were synthesized using bromoethylsulfonium triflate and easily available amino acid/aza-Morita–Baylis–Hillman-derived allylic amines. The simple transformation displays a very high degree of diastereoselectivity and enables access to a diverse range of densely substituted pyrrolidine-based bicycles.
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Fritz et al. (2013) studied this question.
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