1-Methoxy-2-alkanones are prepared from ate-complexes formed from 1,2-dimethoxyethenyllithium and trialkylboranes by the reaction with BF3:Et2O, followed by basic hydrogen peroxide oxidation.
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
Double addition d'organometalliques sur des nitriles α-oxygenes R1 CN. Obtention d'amines primaires de type (R1RR')CNH2
作者:R. Gauthier、G.P. Axiotis、M. Chastrette
DOI:10.1016/s0022-328x(00)89345-6
日期:1977.11
Synthesis of the amines (R1RR')CNH2 (I) was carried out by the action of two organometallic compounds RM and R'M' on the α-oxygenated nitriles R1 CN. Aliphatic and unhindered organolithium or α-ethylenic organomagnesiumcompounds must be used in the second addition. The nature of the two metallic atoms of the aminate (R1RR')CN(MM'), precursor of the amine I, has an influence on the yield of this amine
VITAMIN FUNCTIONALIZED GEL-FORMING BLOCK COPOLYMERS FOR BIOMEDICAL APPLICATIONS
申请人:INTERNATIONAL BUSINESS MACHINES CORPORATION
公开号:US20180117162A1
公开(公告)日:2018-05-03
Gel-forming block copolymers were prepared comprising i) a central hydrophilic block consisting essentially of a divalent poly(ethylene oxide) chain and ii) two peripheral monocarbonate or polycarbonate hydrophobic blocks linked to the central block by linking groups bearing one or more hydrogen bond forming *—N(H)—* groups. The hydrophobic blocks comprise one or more vitamin-bearing subunits. The gel-forming block copolymers can be used to prepare various biodegradable and/or biocompatible hydrogel and organogel drug compositions, in particular antimicrobial and/or anti-tumor drug compositions. The hydrogel compositions have utility in depot injections for drug delivery. The hydrogen bonding *—N(H)—* group(s) provide longer in vivo lifetime of the hydrogel before degradation and a more prolonged and controlled release rate of a hydrophobic drug compared to similar hydrogels prepared from poly(ethylene glycol).
Directive effects in the hydroboration of isomeric methoxy-2-hexynes
作者:George W. Kabalka、Suzanne Slayden
DOI:10.1016/s0022-328x(00)94141-x
日期:1975.7
hydroborated to determine the effect of the methoxy group on the direction of the hydroboration. The effect of the methoxy group is to direct the boron atom to the side of the triple bond nearest to it. The magnitude of the directiveeffect increases as the methoxy group approaches the site of unsaturation. However, steric interactions become significant when the substituent is adjacent to the triple bond