Application of an isomerization-ring-closing metathesis strategy to the synthesis of unsaturated seven-membered, benzo-fused heterocycles containing two heteroatoms
作者:Dharmendra B. Yadav、Garreth L. Morgans、Blessing A. Aderibigbe、Lee G. Madeley、Manuel A. Fernandes、Joseph P. Michael、Charles B. de Koning、Willem A.L. van Otterlo
DOI:10.1016/j.tet.2011.02.035
日期:2011.4
An isomerization-RCM approach was utilized to synthesize a number of seven-membered benzo-fused heterocycles containing two heteroatoms (N,O, N,S, and S,O). This approach utilized the ruthenium catalyst [RuClH(CO)(PPh3)3] for the isomerization of allyl groups, eventually followed by the use of the Grubbs second generation catalyst for the formation of the desired products. In most instances thermal
利用异构化-RCM方法合成了许多含有两个杂原子(N,O,N,S和S,O)的七元苯并稠合杂环。该方法利用了钌催化剂[RuClH(CO)(PPh 3)3进行烯丙基的异构化,最后使用Grubbs第二代催化剂形成所需的产物。在大多数情况下,热RCM条件就足够了;然而,在许多情况下,该方法不能使所需的产品具有高温,短时间的微波方法可以提供所需的闭环产品。以这种方式,成功地合成了以下取代的苯并稠合的支架:4,5-二氢-1,5-苯并x氮平,4,5-和2,5-二氢-1,5-苯并噻氮平和2 H -1,5 -苯并沙地平。