New types of hydroxamic acid-based bifunctional chelators are provided. These chelators are designed to chelate metal ions that can be detected either by their paramagnetic or radioactive properties. Conjugation with peptides or protein can be achieved by the presence of a linker moiety in the molecular structure of these chelators.
Convenient method for the preparation of some polyhydroxamic acids: Michael addition of amines to acrylohydroxamic acid derivatives
作者:Nirmal M. Koshti、Hollie K. Jacobs、Patrick A. Martin、Paul H. Smith、Aravamudan S. Gopalan
DOI:10.1016/s0040-4039(00)77052-3
日期:1994.7
readily prepared by the reaction of the appropriate hydroxylamine derivatives with acryloyl chloride. They undergo Michael addition with a variety of amines to give the corresponding O-protected hydroxamate derivatives in moderate to good yields. Subsequent removal of the protecting group provides a convenientmethod for the preparation of a number of mono, di, tri and tetrahydroxamic acids.
The invention is concerned with novel heterocyclyl compounds of formula (I)
wherein A, X, Y
1
, Y
2
, Y
3
, R
3
, R
4
, R
5
, R
6
, R
7
, R
8
, R
9
, R
10
, m, n and p are as defined in the description and in the claims, as well as physiologically acceptable salts thereof. These compounds are antagonists of CCR2 receptor, CCR5 receptor and/or CCR3 receptor and can be used as medicaments.
Cross metathesis-mediated synthesis of hydroxamic acid derivatives
作者:Shital Kumar Chattopadhyay、Subhankar Ghosh、Suman Sil
DOI:10.3762/bjoc.14.285
日期:——
An alternative synthesis of α,ß-unsaturated hydroxamates via cross metathesis between a class-I olefin and N-benzyloxyacrylamide is reported. The reaction proceeds better in the presence of Grubbs' second generation catalyst within short time and in good yields (57-85%) with a range of substrates. Subsequent hydrogenation of each of the CM products delivers the title compounds in moderate to very good
The use of N‐alkoxyacrylamides in a domino aza‐Michael/intramolecular‐Michael reaction for the synthesis of δ‐lactams is presented. This base‐catalyzed process operates under mild conditions and the polysubstituted aza‐heterocycles are isolated in good yields with good to excellent stereocontrol.