A New Synthesis of α-Phenylsulfonyl-γ-lactones and Their Use for Syntheses of Actinidiolide Derivatives
作者:Kenji Uneyama、Manabu Kuyama、Sigeru Torii
DOI:10.1246/bcsj.51.2108
日期:1978.7
The acid-catalyzed cyclization of 2-phenylsulfonyl-4,8-dimethyi-3,7-nonadienoic acid (5) was performed by treatment with sulfuric acid-acetic acid and/or boron trifluoride in various aprotic solvents to afford 2,2,6-trimethyl-9-phenylsulfonyl-7-oxabicyclo[4.3.0]nonan-8-one (4) in 70–75% yield. Similarly, 2-phenylsulfonyl-2-(2,6,6-trimethyl-1,3-cyclohexadienyl)acetic acid provided 2,2,6-trimethyl-9
2-苯磺酰基-4,8-二甲基-3,7-壬二烯酸 (5) 的酸催化环化反应是通过在各种非质子溶剂中用硫酸-乙酸和/或三氟化硼处理得到 2,2, 6-trimethyl-9-phenylsulfonyl-7-oxabicyclo[4.3.0]nonan-8-one (4),产率 70–75%。类似地,2-苯基磺酰基-2-(2,6,6-三甲基-1,3-环己二烯基)乙酸提供2,2,6-三甲基-9-苯基磺酰基-7-氧杂双环[4.3.0]non-4- en-8-一 (7) 的产率为 62%。内酯4a、4b和7被转化为二氢actinidiolide、四氢actinidiolide和4,5-二氢actinidiolide。讨论了5环化的反应条件和机理。