Intramolecular cyclizations of allyl- and prop-2-ynyl-silanes with the terminal group governing the regiochemical outcome of the cyclization
作者:Dieter Schinzer、Jürgen Steffen、Sándor Sólyom
DOI:10.1039/c39860000829
日期:——
The intramolecular additions of allyl- and prop-2-ynyl-silanes to enones and dienones are described; cyclizations carried out using 1.1 equiv. of either EtAlCl2 in toluene or TiCl4 in methylene chloride at low temperature have shown that the terminal group governs the regiochemical outcome of the cyclization, with allylsilane leading to 1,6 addition and prop-2-ynylsilane to 1,4 addition.
描述了烯丙基和丙-2-炔基硅烷在烯酮和二烯酮中的分子内加成。使用1.1当量进行环化。低温下甲苯中的EtAlCl 2或二氯甲烷中的TiCl 4的研究表明,末端基团决定环化的区域化学结果,烯丙基硅烷导致1,6加成,丙-2-炔基硅烷导致1,4加成。