Thermal‐Induced Synthesis of Cyclobute[b]indolines via Intramolecular Formal [2+2] Cycloaddition of Enamines and Triazole‐derived Ketenimines
摘要:
A de novo synthesis of cyclobutene‐fused indoline derivatives via thermally induced intramolecular cyclization was reported. This approach efficiently yields valuable high‐strained cyclobute[b]indolines in moderate to high yields and enables further transformation into other valuable heterocycles, demonstrating its potential in organic synthesis.
Pd/C-Catalyzed Cyclizative Cross-Coupling of Two<i>ortho</i>-Alkynylanilines under Aerobic Conditions: Synthesis of 2,3′-Bisindoles
作者:Bo Yao、Qian Wang、Jieping Zhu
DOI:10.1002/chem.201501020
日期:2015.5.11
A palladium‐catalyzed cyclizative cross‐coupling of two o‐alkynylanilines to 2,3′‐bisindoles underaerobic oxidative conditions was developed. Mechanistic studies suggested that the two catalytic cycles, namely the formation of 3‐alkynylindoles 8 and their subsequent cyclization to bisindoles 5, are temporally separated. The aminopalladation of 3‐alkynylindoles 8 occurred only after all the N,N‐di