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Benzopyran
About: Benzopyran is a research topic. Over the lifetime, 1889 publications have been published within this topic receiving 15235 citations.
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TL;DR: For example, 2.2-Benzopyran-3-one (1, X = H) undergoes strongly regioselective Diels-Alder additions to buta-1,3-diene, isobutene, but-1-ene, and the olefin (6); the adducts derived from (6) and either (1; X = OMe) or (1/X = H), or ( 1/H) or(1/H/OMe) are readily transformed into the aromatic steroids
Abstract: 2-Benzopyran-3-one (1; X = H) undergoes strongly regioselective Diels–Alder additions to buta-1,3-diene, isobutene, but-1-ene, and the olefin (6); the adducts derived from (6) and either (1; X = H) or (1; X = OMe) are readily transformed into the aromatic steroids: (9), (10), (17), (18), 9-epi-(10), 9-epi-(18), the naphthalene (14), and the dihydronaphthalene (15).