作者:Hans-Günther Schmalz、Arne Soicke、Nikolay Slavov、Jörg-Martin Neudörfl
DOI:10.1055/s-0030-1260320
日期:2011.10
etherate as a Lewis acid, acetophenone and benzophenone derivatives bearing a prenyl (or a related) side chain in ortho-position were shown to undergo intramolecular carbonyl―olefin metathesis, in the absence of any transition-metal catalyst. The cationic cyclization process is supposed to proceed via an oxetane intermediate, which fragments to give the cyclization product (indene or 1,2-dihydronaphthalene)
在用三氟化硼醚化物作为路易斯酸处理时,在没有任何过渡金属催化剂的情况下,邻位带有异戊二烯(或相关)侧链的苯乙酮和二苯甲酮衍生物显示出分子内羰基 - 烯烃复分解。阳离子环化过程应该通过氧杂环丁烷中间体进行,该中间体分裂得到环化产物(茚或 1,2-二氢萘)和作为化学计量副产物的酮(丙酮)。几种底物显示出以高达 93% 的产率提供复分解产物。