Intramolecular electrocyclic reactions. Part II. Reactions of 1,5-di-phenylpenta-1,4-dien-3-one
作者:C. W. Shoppes、B. J. A. Cooke
DOI:10.1039/p19720002271
日期:——
An intramolecular electrocyclic reaction of 1,5-diphenylpenta-trans-1,trans-4-dien-3-one as the cation (generated with acetylium ions) affords, by conrotatory cyclisation, 2-acetoxy-trans-4,5-diphenylcyclopent-2-enyl sodium sulphate (XI), which is hydrolysed by hot 2N-sodium hydroxide or sodium carbonate solution with concomitant pinacolic change to 5-hydroxy-2,3-diphenylcyclopent-2-enone (X), sodium
通过旋环化,将1,5-二苯基五-反式-1,反-4-二烯-3-作为阳离子的分子内电环反应通过旋环化提供2-乙酰氧基-反式-4,5-二苯基环戊-2-苯基硫酸钠(XI),经热的2 N氢氧化钠或碳酸钠溶液水解,同时品酸变为5-羟基-2,3-二苯基环戊-2-烯酮(X),乙酸钠和亚硫酸钠。通过旋转环化和还原,用氢碘酸生成相同的阳离子以13%的收率得到反式-3,4-二苯基环戊酮(VII)。