CHITOSAN COVALENTLY LINKED WITH SMALL MOLECULE INTEGRIN ANTAGONIST FOR TARGETED DELIVERY
申请人:Hoffmann-La Roche Inc.
公开号:US20130197205A1
公开(公告)日:2013-08-01
The invention relates to the chitosan polymer derivatives of formula I:
and pharmaceutically acceptable salts and esters thereof, wherein Y, X
1
, X
4
, R1, R2, and n are defined in the detailed description and claims. The chitosan polymer derivatives of formula I bind to or associate with alpha-4-beta-1 (α4β1) and alpha-V-beta-3 (αVβ3) integrin dimers and can be used in delivery formulations to deliver drugs, nucleic acids, or other therapeutic compounds to tissues or cells expressing such integrins.
Flexible Stereoselective Functionalizations of Ketones through Umpolung with Hypervalent Iodine Reagents
作者:Pushpak Mizar、Thomas Wirth
DOI:10.1002/anie.201400405
日期:2014.6.2
The functionalization of carbonyl compounds in the α‐position has gathered much attention as a synthetic route because of the wide biological importance of such products. Through polarity reversal, or “umpolung”, we show here that typical nucleophiles, such as oxygen, nitrogen, and even carbon nucleophiles, can be used for addition reactions after tethering them to enol ethers. Our findings allow novel
On the Nature of the Oxidative Heterocoupling of Lithium Enolates
作者:Brian M. Casey、Robert A. Flowers
DOI:10.1021/ja205017e
日期:2011.8.3
The coupling of enolates through single-electron oxidation is one of the most direct routes for generating 1,4-dicarbonyls. Recent work on the intermolecularheterocoupling of equimolar amounts of two different enolates through single-electron oxidation has shown that synthetically useful yields beyond those predicted by statistics can be obtained. To determine the underlying basis for the selective
An efficient method for the preparation of C2-symmetric, chiral alk-2-ene-1,4-diols (4) has been achieved, based on the borane-mediated reduction of symmetric alk-2-ene-1,4-diones (2) in the presence of oxazaborolidine (R)-1. In general, the presence of the double bond in 2 has been beneficial (compared with the related saturated 1,4-diketones 3) not only as far as the stereoselectivity in the reduction