BENZIMIDAZOLE COMPOUNDS THAT ARE VITRONECTIN RECEPTOR ANTAGONISTS
申请人:SCHERING CORPORATION
公开号:EP1135374B9
公开(公告)日:2007-02-21
Rearrangement of N<sub>α</sub>-Protected <scp>l</scp>-Asparagines with Iodosobenzene Diacetate. A Practical Route to β-Amino-<scp>l</scp>-alanine Derivatives
作者:Lin-hua Zhang、Goss S. Kauffman、Jaan A. Pesti、Jianguo Yin
DOI:10.1021/jo9702756
日期:1997.10.1
A general synthetic method for the Hofmann rearrangement of protected asparagines has been developed. Reaction of asparagine derivatives with iodosobenzene diacetate (PIDA) in mixed solvents produces beta-amino-L-alanines in good yield. Advantages over the commonly used reagent bis(trifluoroacetoxy)iodobenzene have been discussed.
The Enantiospecific Synthesis of an Isoxazoline. A RGD Mimic Platelet GPIIb/IIIa Antagonist
作者:Lin-hua Zhang、J. C. Chung、T. D. Costello、I. Valvis、P. Ma、S. Kauffman、R. Ward
DOI:10.1021/jo9612537
日期:1997.4.1
A convergent, large-scale, chiral synthesis of isoxazoline 1 has been achieved in 37% overall yield and >99.6% optical purity, starting From L-asparagine and 4-cyanobenzaldehyde. Hofmann reaction of N-alpha-n-Boc-L-asparagine with iodosobenzene diacetate provides optically pure N-alpha-Boc-L-alpha,beta-diaminopropionic acid (8) in 75% yield. A process of lipase resolution-base catalyzed epimerization gives the single enantiomer 5. Reaction of acid 5 with amine 9 in the presence of thionyl chloride forms the framework of 1. A Pinner reaction of intermediate 4 in methyl acetate or anisole, followed by an amidination with ammonium acetate, gives optically pure product 1.
The chiral specific synthesis of DMP 754, a platelet GP antagonist