Novel synthesis of nine-membered oxa-heterocycles by Pd(0)-catalyzed intramolecular Heck reaction via unusual 9-endo-trig-mode cyclization.

[摘要]：Syntheses of nine-membered oxa-heterocyclic compds. by the application of the intramol. Heck reaction were difficult to develop. Herein, we describe the synthesis of this class of compds. through 9- and 8-endo-trig cyclization, resp., a rare mode of cyclization in the literature.

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