described, including (i) NaBH4-mediated reduction of o-cinnamyl chalcones and (ii) sequential BF3·OEt2-mediated intramolecular annulation of the resulting alkenols. The plausible mechanism is proposed and discussed herein. This protocol provides highly effective stereocontrolled cinnamyl-enone cross-coupling to construct three contiguous trans-trans stereocenters and one (E)-configured alkenyl or styryl
在本文中,描述了一种简单的合成
1-乙烯基
茚满的途径,包括(i)NaBH 4介导的邻肉桂基
查耳酮的还原,以及(ii)连续BF 3 ·OEt 2介导的所得烯醇的分子内环化。本文提出并讨论了合理的机制。该方案提供了高效的立体控制肉桂基-烯酮交叉偶联,以构建三个连续的反式-反式立体中心和一个(E)-构型的烯基或
苯乙烯基。