Cyclopentanoids from phenol. Part 4. 3-Substituted 4-hydroxycyclopent-2-enones
作者:Robert M. Christie、Melvyn Gill、Rodney W. Rickards
DOI:10.1039/p19810000593
日期:——
Various 3-halogeno- and 3,5,5-trihalogeno-4-hydroxycyclopent-2-enone derivatives were prepared from 3,5,5-trichloro-4-hydroxycyclopent-2-enone (2), which is available in two steps from phenol via(1R*,4R*)-3,5,5-trichloro-1,4-dihydroxycyclopent-2-ene-1-carboxylic acid (1). Conjugate addition–elimination reactions of the 3-chloro-4-(dimethy-t-butylsilyloxy)-, the 3-chloro-4-tetrahydropyranyloxy-, and
由3,5,5-三氯-4-羟基环戊-2-烯酮(2)制备各种3-卤代和3,5,5-三卤代-4-羟基环戊-2-烯酮衍生物(2),可分两步获得通过(1 R *,4 R *)-3,5,5-三氯-1,4-二羟基环戊-2-烯-1-羧酸(1)从苯酚中得到。共轭3-氯-4-(二甲基叔丁基甲硅烷氧基)-,3-氯-4-四氢吡喃氧基-和5,5-二氯-3-碘-4-四氢吡喃氧基-环戊-2-的加成-消除反应分别用铜酸锂和镁酸镁试剂制得的烯酮(20),(21)和(7)可高产率地产生合成上有用的3-烷基-4-羟基环戊-2-烯酮。