Synthesis of 2,3,4,6,7,8-Hexahydro-5H-1-
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Hermann Hombrecher; Paul Margaretha; Paul Tissot
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Article
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1986
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John Wiley and Sons
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German
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I211 Genbve 4 (5. V .86) ~ Comparative results on the reduction of 4,6,7,8-tetrahydro-7,7-dimethyl-2H-1 -benzopyran-2,5(3H)-diones 1 are reported. Hydride reduction (LiAIH, in EtzO or NaBH, in i-PrOH) affords 2,3,4,6,7,8-hexahydro-5H-l-benzopyran-5-ones 5 in 30-60 % isolated yield. Photochemical red