作者:Martin A. Lovchik、Andreas Goeke、Georg Fráter
DOI:10.1021/jo062264v
日期:2007.3.1
2-diethyl-3-(prop-1E-en-1-yl)cyclobutanone (S)-(E)-18 and (3R)-2,2-diethyl-3-(prop-1Z-en-1-yl)cyclobutanone (R)-(Z)-18, in a ratio of 85:15, with almost complete transfer of chirality (>97%). The absolute configuration of (S)-17 was determined by X-ray diffraction analysis of the camphanoate derivative 16. The absolute configuration of the cyclobutanone products (S)-(E)-18 and (R)-(Z)-18 was determined by Raman optical
据报道,通过烯丙基重排(S N i '反应)进行分子内亲核取代的机理研究以及对取代的环丁酮的新的立体选择途径的报道。4,4-二烷基-5-氧代己-2- ë烯-1-基甲磺酸酯4转化为2,2-二烷基-3- vinylcyclobutanones 6被S Ñ我'环闭合。反应的立体化学分析是通过(6 S)-6-氯-3,3-二乙基庚基4 E -en-2-one(S)-17的闭环实现的,C(6)的绝对构型定义为),得到(3 S)-2,2-二乙基-3-(prop-1 E-en-1-基)环丁酮(S)-(E)-18和(3 R)-2,2-二乙基-3-(prop-1 Z -en-1-基)环丁酮(R)-(Z)-18,比例为85:15,手性几乎完全转移(> 97%)。(S)-17的绝对构型是通过对樟脑酸酯衍生物16进行X射线衍射分析确定的。环丁酮产物(S)-(E)-18和(R)-(Z)-18的绝对构型用拉曼光学活性光