An Approach to Benzophosphole Oxides through Silver- or Manganese-Mediated Dehydrogenative Annulation Involving C—C and C-P Bond Formation

摘要

Benzophosphole derivatives have recently attracted much attention in the field of materials chemistry because of their unique optical and electronic properties. However, synthetic approaches to such promising frameworks are so far limited. Most of the currently available methods rely on the cyclization of phenylphosphorus compounds with alkynyl groups preinstalled in the ortho position; these precursors are usually prepared through complicated multistep reactions. Moreover, the substituent tolerance is low because the cyclizations are performed under strongly basic conditions. To expand the application of benzophosphole species, the development of new, effective processes for synthesizing them from relatively simple starting materials is much needed.