A Novel Heterocumulenic Pauson-Khand Reaction of Alkynylcarbodiimides: A Facile and Efficient Synthesis of Heterocyclic Ring-fused Pyrrolinones
摘要:
The first examples of the heterocumulenic Pauson-Khand reaction are described. Alkynylcarbodiimides undergo an intramolecular Pauson-Khand cycloaddition upon heating in the presence of Mo(CO)(6) and DMSO to afford 4,5-dihydro-1H-pyrrolo[2,3-b]pyrrolin-2-ones and 1H-pyrrolo[2,3-b]indol-2-ones.
Synthesis of Indolyl Imidazole Derivatives via Base-Promoted Tandem Reaction of <i>N</i>-[2-(1-Alkynyl)phenyl]carbodiimides with Isocyanides
作者:Wenyan Hao、Yuanyuan Jiang、Mingzhong Cai
DOI:10.1021/jo402552c
日期:2014.4.18
An efficientroute to indolyl imidazole derivatives has been developed through a base-promoted tandemreaction of N-[2-(1-alkynyl)phenyl]carbodiimides with isocyanides in DMSO at 40 °C. The present tandem process allows the assembly of a variety of indolyl imidazole derivatives in moderate to good yields.
An efficient, Rh-catalyzed intramolecular Pauson-Khand-type carbonylation of alkyne-carbodiimides leading to 4,5-dihydro-1H-pyrrolo[2,3-b]pyrrolin-2-ones and 1H-pyrrolo[2,3-b]indol-2-ones is described.