作者:Robert T. Yu、Tomislav Rovis
DOI:10.1021/ja057803c
日期:2006.3.1
rhodium(I)-catalyzed [2 + 2 + 2] cycloaddition between alkenyl isocyanates and alkynes has been developed. Heating a mixture of an alkenyl isocyanate and a symmetrical internal alkyne in the presence of [Rh(ethylene)2Cl]2/P(4-OMe-C6H4)3 in toluene delivers substituted indolizinones and quinolizinones. Depending on the substrates, a rare fragmentation of the isocyanate unit can be involved within the cycloaddition process
已经开发了铑(I)-催化的烯基异氰酸酯和炔烃之间的[2+2+2]环加成。在甲苯中的 [Rh(乙烯)2Cl]2/P(4-OMe-C6H4)3 存在下加热烯基异氰酸酯和对称内炔的混合物,得到取代的吲哚嗪酮和喹啉酮。根据底物的不同,在环加成过程中可能会涉及异氰酸酯单元的罕见断裂,以提供嵌入在吲哚满酮中的乙烯基酰胺。