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Studies on the syntheses of heterocyclic compounds. Part DCXII. A simple synthesis of benzopyran and dibenzopyran derivatives |
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| Authors: | Tetsuji Kametani Kazuo Kigasawa Mineharu Hiiragi Haruhide Ishimaru Nagatoshi Wagatsuma Seiji Haga Osamu Kusama |
| Abstract: | trans-2-(3-Hydroxyphenyl)cyclohexanol (1b) was converted into 6-methyl-6-phenylbenzopyran (11a) and 6-spirocyclohexanobenzopyran (11b) by phenolic cyclization or under acidic condition. This type of reaction was also applied to the synthesis of 3,4-dihydro-6-methoxy-1-methoxycarbonyl-1-methyl-1H-2-benzopyran (IV). |
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