Stereoselective Gold(I) Domino Catalysis of Allylic Isomerization and Olefin Cyclopropanation: Mechanistic Studies
作者:Sebastian Klimczyk、Xueliang Huang、Hanspeter Kählig、Luís F. Veiros、Nuno Maulide
DOI:10.1021/acs.joc.5b00666
日期:2015.6.5
Gold(I) catalysis of olefin activation is still a rare feature in the repertoire of that metal. Mechanistic studies on the gold(I)-catalyzedcyclopropanation of allyl-substituted sulfonium ylides, including kinetic analysis as well as detailed computational studies, reveal that the reaction proceeds through activation of the alkene moiety. Furthermore, a novel competitive allylic isomerization pathway
A Metal-Free Cycloaddition of α-Diazoacetates with Amino Acid-Derived NHPI Esters for the Facile Synthesis of 1,2,4-Triazoles
作者:Mingyu Luo、Qiushi Shen、Heyi Su、Jian Mei Li、Chun-Ming Chan、Wing-Yiu Yu
DOI:10.1021/acs.orglett.4c01852
日期:2024.7.5
coupling of α-diazoacetates with amino acid-derived alkyl N-hydroxy phthalimide esters, under metal-free conditions involving 1,8-diazabicyclo(5.4.0)undec-7-ene as the base, with which highly functionalized 1,2,4-triazoles can be obtained in excellent yields with remarkable functional group tolerance. Preliminary studies revealed that 1,2,4-triazole 3a exhibits potent inhibition of tyrosinase activities
A [3,3]-sigmatropic process catalysed by acetate. The decarboxylative Claisen rearrangement
作者:Damien Bourgeois、Donald Craig、Fabienne Grellepois、David M. Mountford、Alan J.W. Stewart
DOI:10.1016/j.tet.2005.09.073
日期:2006.1
Allylic tosylacetates and tosylmalonates undergo acetate-catalysed decarboxylative Claisen rearrangement in the presence of N,O-bis(trimethylsilyl)acetamide. The homoallylic sulfones formed in these transformations correspond to the products of regiospecific allylation of sulfone-stabilised carbanions. A mechanistic rationale is proposed. (c) 2005 Elsevier Ltd. All rights reserved.
KOSKINEN, ARI M. P.;MUNOZ, LUIS, J. CHEM. SOC. CHEM. COMMUN.,(1990) N, C. 652-653