Reaction of 4-methyl, 4-phenyl, and 4-hydrogen substituted 1-lithio-1,3-butadienes with aldehydes: preparation of multiply substituted cyclopentadienes
作者:Zhihui Wang、Hongyun Fang、Zhenfeng Xi
DOI:10.1016/j.tet.2006.04.083
日期:2006.7
acidic solution. Reaction mechanism study revealed that these cyclopentadienes were formed via an acid-promoted cyclization of conjugated dienols. Thus, stereodefined all-cis substituted dienols or a wide diversity of substituted cyclopentadienes can be obtained from the same 1-lithio-1,3-butadiene reagent and aldehyde by adjusting the hydrolysis conditions.
研究了醛与丁二烯基骨架第4位上具有甲基,苯基或氢取代基的1-lithio-1,3-丁二烯试剂的反应。使用强酸性溶液水解后,可以高收率获得多取代的环戊二烯衍生物。反应机理研究表明,这些环戊二烯是通过酸促进的共轭二烯醇环化反应形成的。因此,可以通过调节水解条件,从相同的1-硫代-1,3-丁二烯试剂和醛中获得立体定义的顺式取代的二烯醇或种类繁多的取代的环戊二烯。