作者:K. N. Shavrin、V. D. Gvozdev、O. M. Nefedov
DOI:10.1007/bf02503489
日期:1998.6
(Alk-1-ynyl)chlorocarbenes (3), generated from 1,1-dihaloalk-2-ynes and 3-substituted 3-bromo-1,1,1-trichloropropanes under the action of (BuOK)-O-t in THF at 20 degrees C, react with excess alkali metal alkoxide 4 to give 3-substituted 2-(alk-1-ynyl)oxiranes (6) in 26-78%; yields, most likely as a result of insertion of carbene 3 into the alpha C-H bond of alkoxides 4 and subsequent cyclization of the resulting 1-substituted 2-chloro-2-(alk-1-ynyl)etoxides. The yields of oxiranes 6 depend on the nature of the alkali metal used to prepare alkoxides 4 and on the method employed for the preparation of the latter.
(丙-1-炔基)氯卡宾(3)由1,1-二卤代丙-2-炔与3-取代的3-溴-1,1,1-三氯丙烷,通过在四氢呋喃中用丁基氧化钾-O-t加热至20℃,与过量的碱金属烷基氧化物4反应,得到的产率为26-78%的3-取代的2-(丙-1-炔基)环氧乙烷(6)。产率的变化很可能是由于氯卡宾3插入到烷基氧化物4的α-C-H键,随后发生环化反应生成1-取代的2-氯-2-(丙-1-炔基)乙基氧化物所致。环氧乙烷6的产率依赖于制备烷基氧化物4时所用的碱金属种类以及制备方法。