Reaction of alcohols with dihydropyran in the presence of a catalytic amount of Sc(OTf)3 provides efficiently the corresponding tetrahydropyranyl ethers. After the reaction, the catalyst can be recovered quantitatively from the aqueous media and reused without loss of the activity.
Iron-Catalyzed C(Sp<sup>3</sup>)–H Borylation, Thiolation, and Sulfinylation Enabled by Photoinduced Ligand-to-Metal Charge Transfer
作者:Jia-Lin Tu、Ao-Men Hu、Lin Guo、Wujiong Xia
DOI:10.1021/jacs.3c01082
日期:——
(LMCT) process. These reactions exhibit remarkably broad substrate scope (>150 examples in total), and most importantly, all of these three reactions show unconventional regioselectivity, with the occurrence of C(sp3)–H borylation, thiolation, and sulfinylation preferentially at the distal methyl position. The procedures are operationally simple and readily scalable and provide access to high-value products
Bismuth(III) bromide in organic synthesis. A catalytic method for the allylation of tetrahydrofuranyl and tetrahydropyranyl ethers
作者:Scott W. Krabbe、Veronica V. Angeles、Ram S. Mohan
DOI:10.1016/j.tetlet.2010.08.079
日期:2010.10
A bismuth bromide-catalyzed (10.0 mol %) multicomponent reaction involving the allylation of THF- and THP-ethers, followed by in situ derivatization with acetic anhydride to generate highly functionalized esters has been developed under solvent-free conditions. To the best of our knowledge, this is the first report of a catalytic procedure for the allylation of THF- and THP-ethers to yield ring-opened products. (C) 2010 Elsevier Ltd. All rights reserved.
TSUTSUI, HIRONORI;MUTO, MASAKAZU;MOTOYOSHI, KATSUYUKI;MITSUNOBU, OYO, CHEM. LETT.,(1987) N 8, 1595-1598
Acetalization of Enol Ethers with Alcohols under Visible Light Irradiation Using BINOLs as Photoacid Catalysts
作者:Xun Zhang、Saihu Liao、Haonan Liu、Yueyong Chen、Deng An
DOI:10.1055/a-1799-7464
日期:2022.5
substituted 1,1′-bi-2-naphthols (BINOLs) are demonstrated as effective photoacid catalysts for promoting the acetalization of enol ethers with alcoholsunder irradiation with visiblelight. The reactions proceed efficiently with a wide range of substrates under mild, near neutral conditions.