Synthesis of vinyldihydropyrane by cooperative catalysis
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Abstract
D5-Unsaturated aldehydes with a suitably positioned allylic halide, or phosphate, leaving group undergo doubly-catalyzed cyclization to give dihydropyran derivatives. The cyclization proceeds under the synergetic action of diazabicycloundecene and Pd(PPh3)4. This type of transformation was also accomplished with an aryl ketone.
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