Herein, we describe unprecedented access to all-carbon or heterocyclic seven-membered ring frameworks from 1,8-ene-ynes promoted by inexpensive low-valent titanium(II) species, readily available from Ti(OiPr)4 and Grignard reagent. A broad range of cycloheptane, azepane or oxepane derivatives has been obtained (19 examples) with moderate to good yields and an excellent selectivity (up to 95/5 d.r.)
在本文中,我们描述了从廉价的低价
钛(II)物种(可轻松从Ti(OiPr)4和Grignard试剂获得)促进的1,8-烯-炔类化合物到全碳或杂环七元环骨架的空前访问。已经获得了多种
环庚烷,氮杂
戊烷或氧杂
环丁烷衍
生物(19个实例),具有中等至良好的收率和出色的选择性(高达95/5 dr)。