作者:Robert E. Banks、J. Allen Miller、M. John Nunn、Philip Stanley、Timothy J. R. Weakley、Zakir Ullah
DOI:10.1039/p19810001096
日期:——
2-Methylbut-3-yn-2-ol (9) is efficiently converted into 6-formyl-3,6-dimethylcyclohex-2-enyl acetate (4b) and into 6-acetyl-3,6-dimethylcyclohex-2-enyl acetate (4c)via highly regio- and stereo-selective Diels–Alder cycloadditions of 3-methylbuta-1,3-dienyl acetate (2b). The cycloadduct (4b) is converted by base into 4a,5,6,8a-tetrahydro-4a,7-dimethylcoumarin (13b), whilst the cycloadduct (4c) yields 2,3,4a
2-甲基丁-3-yn-2-ol(9)有效地转化为6-甲酰基-3,6-二甲基环己-2-烯基乙酸酯(4b)和6-乙酰基3,6-二甲基环己-2-烯基通过高度区域选择性和立体选择性的Diels-Alder环加成乙酸3-甲基丁酯1,,3-二烯基乙酸酯(2b)生成乙酸酯(4c )。环加合物(4b)被碱转化为4a,5,6,8a-四氢-4a,7-二甲基香豆素(13b),而环加合物(4c)产生2,3,4a,5,6,8a-六氢- 2-羟基-2,4a,7-三甲基苯并吡喃-4-酮(15),其结构通过X射线分析证实。(13b)和(15)都具有单端孢菌烯的许多结构特征,并且可能在它们的总合成中具有价值。