叔膦催化联烯酸酯和对亚甲基苯醌烯烃不对称共轭二烯基化反应

来源 :中国化学会第十六届全国有机合成化学学术研讨会 | 被引量 : 0次 | 上传用户:ming_yue_zhang
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  叔膦等路易斯碱催化联烯酸酯的反应发展多年来,多种反应类型及其手性合成被发现报道,如Umpolung加成、[m+n]环加成、Rauhut-Currier反应等,在一些药物分子合成及全合成中该方法学也被广泛应用.1值得注意的是,1992年Trost课题组首次发现联烯酸酯可以在叔膦催化作用下异构成共轭二烯的反应(图1),2该方法迅速被研究并成为构建分子内共轭二烯类的一种重要方法.3在过去的几十年里,还没有关于联烯酸酯异构化成共轭二烯的分子间报道,如何实现联烯酸酯分子间二烯基化及构建具有光学活性的共轭二烯基化产物成为一个挑战,也是对联烯化学认识的拓展,有助于进一步理解联烯参与反应的机理和历程.1,1-二芳基取代手性化合物广泛存在于活性天然产物和药物分子中,如候选药物分子CDP840(PDE4抑制剂)、药物分子托特罗定(R-tolterodine)等都具有1,1-二芳基取代结构且含有手性中心化合物,其中对亚甲基苯醌烯烃(p-QM)是合成二芳基取代骨架的重要前体.4我们以对亚甲基苯醌烯烃(p-QM)为原料,通过手性螺环单膦(R-SITCP)催化作用顺利的实现了δ-取代联烯酸酯和p-QMs的首例分子间1,6-加成/异构化/芳构化串联反应合成二芳基取代含共轭二烯的化合物(图1).相应的氘代标记和控制实验证实了联烯1,2-氢迁移过程,且产物易于进行多种转化.5
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