This invention relates to compounds which are useful as enhanced propertied pharmaceutical compounds for both human and veterinary application. The pharmaceutical compounds which are suitable for use in this invention are those compounds which can be substituted with a moiety, said moiety comprising a substituent which enhances or changes the properties of the pharmaceutical compound. The chemical modification of drugs into labile derivatives with enhanced physicochemical properties that enable better transport through biological barriers is a useful approach for improving-drug delivery.
Asymmetric hydrogenation of 3-alkylidene-2-piperidones using Noyori's catalyst. Effect of N-substituents on the enantioselectivity
作者:John Y.L. Chung、Dalian Zhao、David L. Hughes、James M. McNamara、Edward J.J. Grabowski、Paul J. Reider
DOI:10.1016/0040-4039(95)01546-9
日期:1995.10
The enantioselectivity in the asymmetrichydrogenation of 3-alkylidene-2-piperidones catalyzed by BINAP-Ru(II) complex was found to be significantly effected by the internal substituents on the lactam nitrogen, affording the corresponding 3-alkyl-2-piperidones in 52–92% ee.
A Highly Efficient Synthesis of Fibrinogen Receptor Antagonist L-734,217 via a Novel Chemoselective Silyl-Mediated Conjugate Addition of δ-Lactams to 4-Vinylpyridine
作者:John Y. L. Chung、David L. Hughes、Dalian Zhao、Zhiguo Song、David J. Mathre、Guo-Jie Ho、James M. McNamara、Alan W. Douglas、R. A. Reamer、Fuh-Rong Tsay、Richard Varsolona、James McCauley、Edward J. J. Grabowski、Paul J. Reider
DOI:10.1021/jo951214f
日期:1996.1.1
A highly practical chromatography-free six-step synthesis of L-734,217 suitable for large scale preparation is described. The key chiral pyridine acid intermediate (R)-1 was prepared in four steps based on a novel chemoselective silyl-mediated conjugate addition of ethyl (2-oxopiperidin-1-yl)acetate to 4-vinylpyridine and a highly productive, recyclable, kinetic resolution with quinine. Subsequent salt breaking/peptide coupling with benzyl 3-(R)-aminobutyrate (2) in a biphasic system, followed by concomitant hydrogenation of the pyridine ring and debenzylation afforded L-734,217 in 20% overall yield (30% with one recyle) from 2-piperidone. The mechanism of this key conjugate addition to 4-vinylpyridine was studied by C-13 NMR.
ENHANCED PROPERTIED PHARMACEUTICALS
申请人:ROHM AND HAAS COMPANY
公开号:EP1272463A1
公开(公告)日:2003-01-08
[EN] ENHANCED PROPERTIED PHARMACEUTICALS<br/>[FR] PRODUITS PHARMACEUTIQUES AUX PROPRIETES AMELIOREES