Ruthenium Porphyrin Catalyzed Intramolecular Carbenoid C−H Insertion. Stereoselective Synthesis of Cis-Disubstituted Oxygen and Nitrogen Heterocycles
作者:Wai-Hung Cheung、Shi-Long Zheng、Wing-Yiu Yu、Guo-Chuan Zhou、Chi-Ming Che
DOI:10.1021/ol034806q
日期:2003.7.1
[reaction: see text] A ruthenium porphyrin-catalyzed stereoselective intramolecular carbenoid C[bond]H insertion is described. Using [Ru(II)(TTP)(CO)] as catalyst, aryl tosylhydrazones are converted to 2,3-dihydrobenzofurans, 2,3-dihydroindoles, and beta-lactams in good yields and remarkable cis selectivity (up to 99%). Enantioselective synthesis of 2,3-dihydrobenzofurans is also achieved with [Ru(II)(D(4)-Por*)(CO)]
[反应:见正文]描述了钌卟啉催化的立体选择性分子内类胡萝卜素C H键插入。使用[Ru(II)(TTP)(CO)]作为催化剂,芳基甲苯磺酰hydr以良好的收率和显着的顺式选择性(高达99%)转化为2,3-二氢苯并呋喃,2,3-二氢吲哚和β-内酰胺。 。以[Ru(II)(D(4)-Por *)(CO)]为催化剂也可完成2,3-二氢苯并呋喃的对映选择性合成,且ee最高可达96%。