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。