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Synthesis of 3,4-disubstituted 2H-benzopyrans through C-C bond formation via electrophilic cyclization.


ABSTRACT: The electrophilic cyclization of substituted propargylic aryl ethers by I2, ICl, and PhSeBr produces 3,4-disubstituted 2H-benzopyrans in excellent yields. This methodology results in vinylic halides or selenides under mild reaction conditions and tolerates a variety of functional groups, including methoxy, alcohol, aldehyde, and nitro groups.

PROVIDER: S-EPMC2527782 | BioStudies |

REPOSITORIES: biostudies

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