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 derivedfrom 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.