Synthesis of P-Stereogenic Phospholene Boranes via Asymmetric Deprotonation and Ring-Closing Metathesis

[摘要]：The first examples of the asymmetric synthesis of P-stereogenic vinylic phospholene boranes are described. The synthetic approach is concise and flexible. The route involves (i) asymmetric deprotonation-allylation of a dimethyl phosphine borane; (ii) telescoped regioselective deprotonation, paraformaldehyde trapping, and hydroxyl group elimination to give a diene; and (iii) ring-closing metathesis.

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