A facile synthesis of alkylated nitrogen heterocycles catalysed by 3D mesoporous aluminosilicates with cage type pores in aqueous medium
作者:Rajashree Chakravarti、Pranjal Kalita、S. Tamil Selvan、Hamid Oveisi、V. V. Balasubramanian、M. Lakshmi Kantam、Ajayan Vinu
DOI:10.1039/b914628h
日期:——
Friedel–Crafts alkylation of nitrogenheterocycles such as indoles and pyrroles with epoxides has been efficiently carried out using cage-type mesoporous aluminosilicates as recyclable catalysts in water under environmentally benign and mild conditions.
Fluoroboric acid adsorbed on silica gel catalyzed regioselective ring opening of epoxides with nitrogen heterocycles
作者:B.P. Bandgar、Abasaheb V. Patil
DOI:10.1016/j.tetlet.2006.10.118
日期:2007.1
Aryl epoxides can be opened in a regioselective and efficient manner with nitrogenheterocycles such as indoles, pyrroles and imidazoles in the presence of a catalytic amount of HBF4–SiO2 under mild conditions to afford the corresponding C-alkylated derivatives in good yields and with a high regioselectivity.
The reaction of epoxides with nitrogen heterocycles such as indoles, pyrroles, imidazoles, and pyrazoles was studied under both high-pressure and silica gel-catalyzed conditions. Whereas it has been reported that the treatment of indole with styrene aside at in kbar and 42 degrees C for 24 h gave 2-(3-indolyl)-2-phenylethanol in 56% yield, the same compound was obtained in 88% yield when the reaction was conducted on silica gel at rt for 1 week. Similarly, efficient reaction of epoxides with pyrroles, imidazoles, and pyrazoles was achieved. In terms of stereochemical features, the epoxide ring opening reaction of (R)-(+)-styrene oxide with indole was found to proceed stereoselectively in an S(N)2 fashion at the benzyl carbon, in either ease.
Introduction of an Effective and Economical Heterogeneous Ruthenium Catalyst for Regioselective Ring-Opening of Epoxides and the Friedel– Crafts Alkylation Reaction of Indoles and Pyrroles
作者:Khalil Tabatabaeian、Mohammad Ali Zanjanchi、Nosrat O. Mahmoodi、Tooraj Eftekhari
DOI:10.2174/1570178614666170117152437
日期:2017.4.13
catalyst has a high potential for the ring opening of epoxides with alcohols, indoles and pyrroles under gentle conditions. Conclusion: In summary, a simple, rapid, economical and an effective route for the alcoholysis of epoxides and therefore the Friedel-Crafts alkylation of indoles and pyrroles via an basically regioselective ring opening of epoxides with aliphatic and aromatic amines using IRMOF-3-PI-RuCl3