Zinc-Catalyzed Multicomponent Reactions: Easy Access to Furyl-Substituted Cyclopropane and 1,2-Dioxolane Derivatives
作者:Sergio Mata、Jesús González、Rubén Vicente、Luis A. López
DOI:10.1002/ejoc.201600393
日期:2016.5
cyclopropyl-substituted furan derivatives by a zinc-catalyzed three-component coupling of 1,3-dicarbonylic compounds, 2-alkynals and alkenes is reported. A sequence consisting of an initial Knoevenagel condensation, cyclization, and a final cyclopropanation reaction would account for the formation of the final products. In most cases, this multicomponent process proceeds in good yield under mild reaction conditions and
Zinc-Catalyzed Functionalization of SiH Bonds with 2-Furyl Carbenoids through Three-Component Coupling
作者:Sergio Mata、Luis A. López、Rubén Vicente
DOI:10.1002/chem.201501155
日期:2015.6.15
A three‐component coupling of alk‐2‐ynals, 1,3‐dicarbonyls and silanes is reported. ZnCl2 serves as an inexpensive and low‐toxic catalyst for the overall transformation, which involves Knoevenagel condensation, cyclization, and carbene SiH bond insertion. The process takes place with high atom economy in the absence of organic solvents and shows a broad scope. This reaction is also applicable to the
A stereoselective synthesis of anti-γ,δ-alkynyl- and -alkenyl-β-hydroxy-α-amino esters from tin(<scp>ii</scp>) enolates of glycinate
作者:Jonathan J. Gridley、Michael P. Coogan、David W. Knight、K. M. Abdul Malik、Christopher M. Sharland、Jirada Singkhonrat、Siân Williams
DOI:10.1039/b306291k
日期:——
Condensations between the tin(II) enolate 11 of ethyl N-tosylglycinate and conjugated ynals 12 and ynones 14 are highly diastereoselective, in favour of the anti-isomers 13 and 15; similar reactions of enals and enones 17 show lower but still useful levels of anti-stereoselectivity.
作者:David W. Knight、Heinz C. Rost、Christopher M. Sharland、Jirada Singkhonrat
DOI:10.1016/j.tetlet.2007.08.097
日期:2007.10
Exposure of a range of 3-hydroxy-2-sulfonylamino-4-alkynes to excess iodine delivers good yields of a series of iodopyrroles. Unexpectedly, the hydroxyl-dihydropyrroles, which were assumed to be the first-formed intermediates, turn out to be stable entities which have been isolated for the first time. (C) 2007 Elsevier Ltd. All rights reserved.
Piers, Edward; Tillyer, Richard D., Journal of the Chemical Society. Perkin transactions I