A straightforward synthesis of L-azetidine-2-carboxylicacid is described, leading to both orthogonally protected versions or totally deprotected L-Aze. The starting material is a commercially available aspartic acid derivative, whose chirality is conserved. The (2-trimethylsilyl)ethanesulfonyl protecting group (SES) acts as a leaving group on the hydroxy function and serves as an activator for the
The 1,3-dipolar cycloaddition to ethylene of N-glycosylnitrones, formed in situ from the partially protected d-mannose- or d-ribose-oximes and various glyoxalates, gave compounds which could be transformed into both enantiomers of 3-t-butoxycarbonyl-isoxazolidine and derivatives thereof.
Poly (Vinyl Alcohol) Polymers, Uses and Preparation Thereof
申请人:Zhu Julian Xiao-Xia
公开号:US20100038297A1
公开(公告)日:2010-02-18
There are provided poly(vinyl alcohol) polymers and copolymers containing vinyl alcohol or vinyl acetate and derivatives thereof such as poly(ethylene glycol)-grafted poly(vinyl alcohol) polymers or polyether-grafted poly(vinyl alcohol) polymers. These polymers can contain various functional groups. Such polymers can be use as polymer matrix or solid support for various chemical substrates such as organic substrates and reagents. Cross-linked poly(vinyl alcohol) polymers and copolymers are also provided. Methods for preparing such polymers as well as several of their uses are also included.
ALPHA AMINOACID ESTER-DRUG CONJUGATES HYDROLYSABLE BY CARBOXYLESTERASE
申请人:GlaxoSmithKline Intellectual Property Development
Limited
公开号:EP3530290A1
公开(公告)日:2019-08-28
Covalent conjugation of an alpha amino acid ester to a modulator of the activity of a target intracellular enzyme or receptor, wherein the ester group of the conjugate is hydrolysable by intracellular carboxylesterase enzyme hCE1 and not by hCE2 or hCE3 to the corresponding acid, leads to selective accumulation of the carboxylic acid hydrolysis product in monocyte/macrophage cell and enables improved or more prolonged enzyme or receptor modulation in those cells relative to the unconjugated modulator.
The present disclosure provides compounds which are immunomodulators and thus are useful for the amelioration of various diseases, including cancer and infectious diseases.