In the presence of BiCl3–Zn(0), nearly equimolar amounts of allyl bromide reacted with carbonyl compounds containing a carboxyl group to afford the corresponding homoallylic alcohols having a carboxyl group or the intramolecular dehydrated lactones in good yields.
The present disclosure is generally directed to antiviral compounds, and more specifically directed to combinations of compounds which can inhibit the function of the NS5A protein encoded by Hepatitis C virus (HCV), compositions comprising such combinations, and methods for inhibiting the function of the NS5A protein.
2-Oxocarboxylic acids or their sodium salts undergo indium-mediated allylation with allylbromide cinnamyl bromide and ethyl 4- bromocrotonate to provide the corresponding 2-allyl derivatives of glycolic lactic mandelic and malic acids. In the case of reactions with cinnamyl bromide or ethyl 4-bromocrotonate high diastereoselectivity is achieved.
作者:Henk Moorlag、Johannes G. de Vries、Bernard Kaptein、Hans E. Schoemaker、Johan Kamphuis、Richard M. Kellogg
DOI:10.1002/recl.19921110304
日期:——
Mandelic and lacticacids are converted to the 1,3-dioxolan-4-ones by treatment with acetone dimethyl acetal. Deprotonation followed by treatment with an allyl acetate and a catalytic amount (1 mol %) of palladium catalyst afforded the allylated dioxolanones, which could be hydrolyzed to the corresponding α-allyl α-hydroxy acids. The lithium enolate of the dioxolanone of mandelic acid was also coupled
Chemoselective Carbonyl Allylations with Alkoxyallylsiletanes
作者:Paul Spaltenstein、Elizabeth J. Cummins、Kelly-Marie Yokuda、Tim Kowalczyk、Timothy B. Clark、Gregory W. O’Neil
DOI:10.1021/acs.joc.8b03028
日期:2019.4.5
include salicylaldehydes and glyoxylic acids. Chemoselectivity in these reactions is thought to arise from a mechanism involving first exchange of the alkyoxy group on silicon with a substrate hydroxyl followed by activation of a nearby carbonyl by the Lewis acidic siletane and intramolecular allylation. In this way, substrates containing multiple reactive carbonyl groups (e.g., dialdehyde or triketone) can