作者:Katrine Qvortrup、Kennedy M. Taveras、Ole Thastrup、Thomas E. Nielsen
DOI:10.1039/c0cc03876h
日期:——
In this paper we describe a highly effective surface modification of SU-8 microparticles, the attachment of appropriate linkers for solid-supported synthesis, and the successful chemical modification of these particles via controlled multi-step organic synthesis leading to molecules attached in an unambiguous manner to the support surface.
Transition-Metal-Free Coupling of Alkynes with α-Bromo Carbonyl Compounds: An Efficient Approach towards β,γ-Alkynoates and Allenoates
作者:Wenbo Liu、Zhengwang Chen、Lu Li、Haining Wang、Chao-Jun Li
DOI:10.1002/chem.201600219
日期:2016.4.18
A direct transition‐metal‐free coupling between alkynes and α‐bromo carbonyl compounds has been developed with ultraviolet (UV) light in aqueous media. This method represents a facile approach to synthetically useful β,γ‐alkynyl esters and amides stereoselectively from two readily available starting materials. As an example of the synthetic application of the products, the alkynyl esters were readily
Mechanistic Studies and Expansion of the Substrate Scope of Direct Enantioselective Alkynylation of α-Ketiminoesters Catalyzed by Adaptable (Phebox)Rhodium(III) Complexes
Mechanistic studies and expansion of the substrate scope of directenantioselectivealkynylation of α-ketiminoesters catalyzed by adaptable (phebox)rhodium(III) complexes are described. The mechanistic studies revealed that less acidic alkyne rather than more acidic acetic acid acted as a proton source in the catalytic cycle, and the generation of more active (acetato-κ(2)O,O')(alkynyl)(phebox)rhodium(III)
A green way to amino acids: α‐Tetrasubstituted α‐amino acid derivatives are formed in high yield and enantioselectivity by using a Rh‐catalyzed enantioselectivealkynylation of α‐ketiminoesters. This reaction, which involves a proton transfer and can be conducted at room temperature, has high substrate scope (see scheme; Cbz=benzyloxycarbonyl, Fmoc=9‐fluorenylmethyloxycarbonyl).
Antibacterial compounds of formula (I) are provided:
as well as stereoisomers, pharmaceutically acceptable salts, esters, and prodrugs thereof; pharmaceutical compositions comprising such compounds; methods of treating bacterial infections by the administration of such compounds; and processes for the preparation of such compounds.