New general synthesis of α-alkoxyketones via α′-alkylation, α-alkylation and α,α′-dialkylation of α-alkoxyketimines
作者:Filip Colpaert、Sven Mangelinckx、Maria Teresa Rocchetti、Norbert De Kimpe
DOI:10.1039/c0ob00662a
日期:——
important intermediates in organic synthesis and flavor compounds in food chemistry, were synthesized by deprotonation of N-(1-alkoxy-2-propylidene)isopropylamine, prepared by condensation of the corresponding α-alkoxyacetone with isopropylamine, and subsequent reaction of the corresponding 1-azaallylic anions with alkyl halides to afford α′-alkylated, α-alkylated and α,α′-dialkylated ketimines. Hydrolysis
GLYCOPEPTIDE AND LIPOGLYCOPEPTIDE ANTIBIOTICS WITH IMPROVED SOLUBILITY
申请人:Rafai Far Adel
公开号:US20120149632A1
公开(公告)日:2012-06-14
The invention relates to derivatives of glycopeptide and lipoglycopeptide antibiotics possessing an altered ionization state with respect to the parent glycopeptide or lipoglycopeptide antibiotic, and having the ability to be regenerated as the parent glycopeptide or lipoglycopeptide antibiotic under physiological conditions. These compounds are useful as antibiotics for the prevention and/or the treatment of bacterial infections.
Origin of the <i>E</i>/<i>Z</i> Selectivity in the Synthesis of Tetrasubstituted Olefins by Wittig Reaction of α-Fluorophosphonium Ylides: An Explanation for the Low Stereoselectivity Observed in Reactions of α-Alkoxy Aldehydes
作者:Dominique Depré、Wim A. A. Vermeulen、Yolande Lang、Jean Dubois、Jan Vandevivere、Jeremy Vandermeersch、Longchuan Huang、Raphaël Robiette
DOI:10.1021/acs.orglett.7b00344
日期:2017.3.17
96/4) by Wittig reactionbetween α-heterosubstituted ketones and α-fluorophosphonium ylides. A detailed study of factors that control stereoselectivity in these reactions shows that stereoselectivity is the result of stabilizing CH···F and N···C═O interactions in the addition TS leading to the E isomer. This analysis provides a rationale for the observed decrease in selectivity for reactions of stabilized
This invention relates to a method for modulating α
2
subtype GABA
A
receptors with heterocyclic compounds of formula I, and salts, solvates and prodrugs thereof. The invention further relates to novel heteocyclic compounds and pharmaceutical compositions containing said compounds. In addition the invention relates to the treatment of depression, an anxiety disorder, a psychiatric disorder, a learning or cognitive disorder, a sleep disorder, a convulsive or seizure disorder or pain
Tandem Acid/Pd‐Catalyzed Reductive Rearrangement of Glycol Derivatives
作者:Tanno A. Schmidt、Benjamin Ciszek、Prasad Kathe、Ivana Fleischer
DOI:10.1002/chem.202000251
日期:2020.3.18
investigations show that the substrate undergoes rearrangement to an aldehyde under [1,2]-H-migration and cleavage of an oxygen-based leaving group. The leaving group is trapped as its formic ester, and the aldehyde is reduced and subsequently esterified to a formate. While the rearrangement to the aldehyde is catalyzed by sulfonic acids, the reduction step requires a unique catalyst system comprising