General Approach to Polycyclic Meroterpenoids Based on Stille Couplings and Titanocene Catalysis
作者:José Justicia、J. Enrique Oltra、Juan M. Cuerva
DOI:10.1021/jo049253r
日期:2004.8.1
steps were the Stille-type coupling of aryl stannanes and allylic carbonates, followed by the titanocene-catalyzed domino cyclization of aryl epoxypolyprenes. The coupling reaction was perfectly compatible with preformed epoxides, while the sequential cyclization, which presumably proceeded via alkyl radicals inert to benzene derivatives, selectively provided exocyclic alkenes.
我们描述了一种新型的收敛过程,该过程已证明在合成广泛的类萜类化合物相关结构中有用,该结构包含连接到具有各种取代方式的非融合芳族亚基的单-,倍半-或双-萜类部分。关键步骤是芳基锡烷和碳酸烯丙酯的Stille型偶联,然后是钛茂金属催化的芳基环氧聚戊二烯的多米诺环化反应。偶联反应与预先形成的环氧化物完全相容,而顺序环化(可能是通过对苯衍生物呈惰性的烷基进行的)选择性地提供了环外烯烃。