Synthesis of Cyclic N-Tosyliminocarbonates by Lewis Acid Catalyzed Allylic Substitution of Trichloroacetimidates
作者:Liene Grigorjeva、Aigars Jirgensons
DOI:10.1002/ejoc.201200378
日期:2012.9
Allylic trichloroacetimidates bearing a δ-N-tosylcarbamoyloxy group were prepared in two steps from the corresponding diols, and their Bronsted and Lewisacidcatalyzed cyclization reactions were investigated. It was found that N-tosylcarbamates derived from secondary and tertiary alcohols bearing alkyl substituents undergo a chemoselective allylic alkylation to give N-tosyliminocarbonates in good
A Diastereoselective Intermolecular Heck Reaction of 1,3-Dioxepins
作者:Christopher G. Nasveschuk、Jeffrey D. Frein、Nathan T. Jui、Tomislav Rovis
DOI:10.1021/ol702294u
日期:2007.11.1
A highly diastereoselective intermolecularHeckreaction of 1,3-dioxepins is reported. Substitution at both the 2- and 4-positions of the dioxepin directs the Pd coordination and subsequent olefin insertion to provide the trans-disubstituted adduct in good yield and high diastereoselectivity. Chemoselective Heckreaction occurs at the dioxepin alkene in the presence of other olefinic functional groups
CeCl3-mediated addition of acetylenic bis-lithium salts to aldehydes and ketones: An efficient route to bis-substituted alkyne diols
作者:Jefferson Luiz Princival、Jeiely Gomes Ferreira
DOI:10.1016/j.tetlet.2017.07.094
日期:2017.9
An efficient, chemoselective protocol to access propargylic diols via a CeCl3-mediated addition reaction is reported. Propargylic alcohols were transformed into the corresponding acetylenic bis-lithium salt intermediates, which react with aldehydes and ketones in the presence of dry CeCl3 to furnish the corresponding bis-substituted alkyne diols. This protocol does not involve protection-deprotection
Assessment of butene-1,4-diols as starting materials for the preparation of π-Allyltricarbonyliron complexes
作者:Roderick W. Bates、David Díez-Martín、William J. Kerr、Julian G. Knight、Steven V. Ley、Anna Sakellaridis
DOI:10.1016/s0040-4020(01)90541-1
日期:1990.1
A novel, highly efficient and selective desilylating method for trialkylsilyl ethers
作者:Adam Shih-Yuan Lee、Hsiu-Chih Yeh、Jiun-Jie Shie
DOI:10.1016/s0040-4039(98)01035-1
日期:1998.7
A series of tert-butyldimethylsilyl, tert-butyldiphenylsilyl and triisopropylsilyl ethers are hydrolyzed to theirs corresponding alcohols in CBr4/CH3OH (0.1 eq. / 10mL) reaction system under refluxing condition. The chemoselectivity can be achieved between primary and secondary triisopropylsilyl ethers when more hindered 2-propanol is used instead of methanol. (C) 1998 Elsevier Science Ltd. All rights reserved.