Synthesis of ipomeamarone via the [2+3] dihydrofuran annulation
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The synthesis of several dihydrofurans of type 179 was accomplished by the flash vacuum pyrolysis of vinyloxiranes of type 178 obtained from the addition of the dienolate of ethyl-2-bromocrotonate (177) to various aldehydes (176). Thus, dihydrofurans were prepared from aldehydes in an overall intermolecular [2+3] dihydrofuran annulation.
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