Enantioselective Synthesis of Dihydrocoumarins<i>via</i>N-Heterocyclic Carbene-Catalyzed Cycloaddition of Ketenes and<i>o</i>-Quinone Methides
作者:Hui Lv、Lin You、Song Ye
DOI:10.1002/adsc.200900544
日期:2009.11
Chiral N-heterocyclic carbenes were found to be efficient catalysts for the formal [4+2] cycloaddition reaction of alky(aryl)ketenes and o-quinone methides to give the corresponding 3,3,4-trisubstituted 3,4-dihydrocoumarins in good yields with good diastereoselectivities and excellent enantioselectivities.
已发现手性N-杂环卡宾是烷基(芳基)乙烯酮与邻醌甲基化物[4 + 2]环加成反应生成相应的3,3,4-三取代3,4-二氢香豆素的有效催化剂。产生具有良好的非对映选择性和优异的对映选择性的产物。