6943-01-7Relevant articles and documents
Au(I)-Catalyzed Domino Cyclization of 1,6-Diynes Incorporated with Indole
Chen, Guzhou,Liu, Peng-Yu,Zou, Huanhuan,Hu, Jiadong,Fang, Xiaowu,Xu, Dongyang,He, Yu-Peng,Wei, Hongbo,Xie, Weiqing
supporting information, p. 2279 - 2284 (2021/04/05)
We disclose herein a Au(I)-catalyzed domino cyclization of 1,6-diynes incorporated with indole. This protocol enabled the diastereoselective buildup of indole-fused azabicyclo[3.3.1]nonanes from linear precursors. Density functional theory calculations showed that the reaction proceeded via an unprecedented cascade dearomatization/rearomatization/dearomatization process. Independent gradient model analysis revealed that a noncovalent attractive interaction between the distal alkyne and the Au/proximal complex was responsible for the chemoselectivity of the first spirocyclization step.
A convenient synthesis of indole and 1,4-dihydropyridine hybrid macromolecules by dimerization of [2-(1h-indol-3-yl)ethyl]pyridinium salts
Ling, Gang,Zhang, Jing,Zhang, Rong-Zheng,Han, Fu-She
, p. 67 - 73 (2018/01/26)
The design and synthesis of a novel type of macrocyclic compounds containing indole and 1,4-dihydropyridine heterocyclic subunits is presented. The key reaction involved in the synthesis was a base-mediated dimerization of [2-(1H-indol-3-yl)ethyl]pyridinium salts. The structure of the macrocycles was unambiguously confirmed by NMR and HRMS spectroscopic and X-ray single crystal diffraction.
Aqueous Titanium Trichloride Promoted Reductive Cyclization of o-Nitrostyrenes to Indoles: Development and Application to the Synthesis of Rizatriptan and Aspidospermidine
Tong, Shuo,Xu, Zhengren,Mamboury, Mathias,Wang, Qian,Zhu, Jieping
, p. 11809 - 11812 (2015/10/05)
Treatment of o-nitrostyrenes with aqueous TiCl3 solution at room temperature afforded indoles through a formal reductive C(sp2)-H amination process. A range of functions such as halides (Cl, Br), carbonyl (ester, carbamate), cyano, hydroxy, and amino groups were tolerated. From β,β-disubstituted o-nitrostyrenes, 2,3-disubstituted indoles were formed by a domino reduction/cyclization/migration process. Mild conditions, simple experimental procedure, ready accessibility of the starting materials and good to excellent yields characterize the present transformation. The methodology was used as a key step in a concise synthesis of rizatriptan and a formal total synthesis of aspidospermidine. Mild and efficient treatment of o-nitrostyrenes with aqueous TiCl3 solution at room temperature afforded indoles through a formal reductive C(sp2)-Hamination process. A concise synthesis of a marketed drug (rizatriptan) and a formal total synthesis of aspidospermidine featuring this novel N-heterocyclization process are reported.