Intramolecullar alkylation of phenols. Part 4. Base-catalysed cyclisation of phenolic enones. Scope and limitations
作者:William S. Murphy、Sompong Wattanasin
DOI:10.1039/p19800001555
日期:——
The phenolic enones (4), (5), (8), (9), and (13) cyclise readily under acidic conditions. However, neither these nor the thin-substituted phenols (11a), (13a), (14a), and (15a) closed under basic conditions. Involvement of unfavourable equilibria is disproved. Comparison is made with related successful cyclisations of the saturated ketone (38) and aldehyde (39). Preliminary results suggest that strict
酚烯酮(4),(5),(8),(9)和(13)在酸性条件下容易环化。然而,这些以及稀取代的酚(11a),(13a),(14a)和(15a)在碱性条件下均未关闭。不利的均衡被卷入其中。与饱和酮(38)和醛(39)的相关成功环化进行了比较。初步结果表明,严格的立体电子学要求对于烯酮环闭合是必需的,并且在一般类型的酚的碱催化的5-内-和6-内-三角环闭合中不满足这些条件(2;n = 0并且n = 1)。