New Approaches to Polysubstituted Pyrroles and γ-Lactams Based on Nucleophilic Addition of Ti(IV) Enolates Derived from α-Diazo-β-keto Carbonyl Compounds to <i>N</i>-Tosylimines
作者:Changqing Dong、Guisheng Deng、Jianbo Wang
DOI:10.1021/jo0605039
日期:2006.7.1
The Ti(IV) enolates derived from α-diazo-β-keto esters or ketones efficiently add to TiCl4-activated N-tosylimines to give δ-N-tosylamino substituted α-diazo-β-keto carbonyl compounds. The diazo decomposition of the addition products occurs under Rh2(OAc)4-catalyzed or photoinduced conditions to afford pyrrole or γ-lactam derivatives, both in high yields.
衍生自α-重氮-β-酮酯或酮的Ti(IV)烯醇化物有效地添加到TiCl 4活化的N-甲苯胺中,得到δ- N-甲苯磺酰基氨基取代的α-重氮-β-酮羰基化合物。加成产物的重氮分解在Rh 2(OAc)4催化或光诱导的条件下发生,以高产率提供吡咯或γ-内酰胺衍生物。