Modular Synthesis of Benzo[b]phosphole Derivatives via BuLi-Mediated Cyclization of (o-Alkynylphenyl)phosphine.

[摘要]：Treatment of an (o-alkynylphenyl)phosphine, 2-PhCYCC6H4P(H)Mes* (Mes* = 2,4,6-tri-tert-butylphenyl) with a stoichiometric amt. of BuLi effects a cyclization reaction to produce a 3-lithiobenzo[b]phosphole, which affords a variety of 3-substituted benzophospholes upon reaction with electrophiles. An example is given for the synthesis of a bis-benzo[b]phosphole, I, which can be further converted to the corresponding benzo[b]phosphole oxide possessing high electron affinity. The crystal structure of I was described.

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