作者:Gavin A. Schmid、Hans-Jürg Borschberg
DOI:10.1002/1522-2675(20010228)84:2<388::aid-hlca388>3.0.co;2-p
日期:2001.2.28
Several examples of thermally induced intramolecular oxy-ene reactions leading to six- or five-membered rings are reported. The yields vary from poor to good, depending on the thermal lability of the substrate. Considering the high temperatures required to effect these transformations (several hours at ca. 250°), the observed diastereoselectivities favoring the trans-1,2-substituted cycloalkane derivatives
报道了几个导致六元或五元环的热诱导分子内氧化烯反应的例子。取决于基材的热不稳定性,产量从差到好不等。考虑到实现这些转变所需的高温(在大约 250° 下几个小时),观察到的有利于反式 1,2-取代的环烷烃衍生物的非对映选择性非常好。在产品 26 的情况下,这些取代基在固态(X 射线证据)和溶液中都显示出更喜欢跨双轴取向,大概是为了避免在双赤道构象异构体中普遍存在的烯丙基应变。