Visible Light-Induced α-C(sp<sup>3</sup>)–H Acetalization of Saturated Heterocycles Catalyzed by a Dimeric Gold Complex
作者:Xiaojia Si、Lumin Zhang、Zuozuo Wu、Matthias Rudolph、Abdullah M. Asiri、A. Stephen K. Hashmi
DOI:10.1021/acs.orglett.0c01924
日期:2020.8.7
situ-formed gold complex. The broad functional group compatibility and substrate scope indicate that our strategy is a promising way to synthesize acetal analogues. The method was successfully applied in late-stage modifications of bioactive molecules. Gramscale syntheses and mechanistic studies are also presented.
Treatment of different types of alcohols with tetrahydrofuran (THF) in the presence of VCl3 and CCl4 smoothly afforded the corresponding THF-based acetals in excellent yields. The reaction is fast at room temperature, and several functional groups are tolerated, with no racemization being observed. A radical mechanism, based on Cl3C. as the active species, is proposed for this novel kind of transformation
Metal-free tetrahydrofuranylation of alcohols with tertbutyl nitrite
作者:Kang Bi、Yue-Ming Cai、Yun-Bing Zhou、Junyue Lin、Miao-Chang Liu
DOI:10.1016/j.tetlet.2020.152251
日期:2020.8
Metal-free tetrahydrofuranylation of alcohols in the presence of tertbutyl nitrite is described, providing a facile and green route for the protection of hydroxy groups. Mechanistic studies demonstrate that this transformation proceeds in a radical way, and involves alkyl nitrite of corresponding alcohol as the key intermediate.
Environmentally Friendly Tetrahydrofuranylation of Alcohols Using NaHSO<sub>4</sub>–SiO<sub>2</sub> under Solvent-free Conditions
作者:Henok H. Kinfe、Sullivan Terblanche、Konanani D. Tshivhase、Livhuwani Ravhura
DOI:10.1246/cl.2012.272
日期:2012.3.5
A simple, environmentally friendly, and efficient tetrahydrofuranylation of alcohols has been developed using NaHSO4–SiO2 (0.5 mol %) as a catalyst under solvent-free conditions to yield corresponding THF ethers in good to excellent yields.
An economic and practical synthesis of the 2-tetrahydrofuranyl ether protective group
作者:J.R. Falck、De Run Li、Romain Bejot、Charles Mioskowski
DOI:10.1016/j.tetlet.2006.05.081
日期:2006.7
Primary, secondary, and tertiary alcohols as well as phenols and carbohydrates are efficiently transformed into the corresponding 2-tetrahydrofuranyl ethers by a combination of Mn(0) powder and CCl4 in tetrahydrofuran. (c) 2006 Elsevier Ltd. All rights reserved.