Ruthenium-Catalyzed Enyne Cycloisomerizations. Effect of Allylic Silyl Ether on Regioselectivity
作者:Barry M. Trost、Jean-Philippe Surivet、F. Dean Toste
DOI:10.1021/ja046824o
日期:2004.12.1
Ruthenium catalysts effect efficiently such single-step cycloisomerization at room temperature in acetone under neutral conditions. The cycloisomerization functions with (E) or (Z) 1,2-disubstituted alkenes. Parameters influencing the enol silane geometry are discussed. The level of selectivity depends on the alkyne substitution, the geometry of the double bond, and the nature of the catalyst. Furthermore
1,6- 和 1,7-烯炔在末端烯丙基位置被叔丁基二甲基甲硅烷基醚基团取代的钌催化环异构化成为形成前所未有的具有几何定义烯醇硅烷的五元或六元环的有效反应. 介绍了对各种非手性 1,6- 和 1,7- 烯炔以及手性烯炔的直接合成途径。钌催化剂在中性条件下在丙酮中在室温下有效地实现这种单步环异构化。环异构化作用与 (E) 或 (Z) 1,2-二取代烯烃。讨论了影响烯醇硅烷几何形状的参数。选择性的水平取决于炔烃取代、双键的几何形状和催化剂的性质。此外,