Synthesis of 5-Bromopyridyl-2-magnesium Chloride and Its Application in the Synthesis of Functionalized Pyridines
作者:Jinhua J. Song、Nathan K. Yee、Zhulin Tan、Jinghua Xu、Suresh R. Kapadia、Chris H. Senanayake
DOI:10.1021/ol0400589
日期:2004.12.1
The 5-bromopyridyl-2-magnesium chloride (2), which was not accessible previously, was efficiently synthesized for the first time via an iodomagnesium exchange reaction with 5-bromo-2-iodopyridine (1). This reactive intermediate was allowed to react with a variety of electrophiles to afford a range of useful functionalized pyridine derivatives. Application of this methodology to 5-bromo-2-iodo-3-picoline provided a simple and economical synthesis of a key intermediate for the preparation of Lonafarnib, a potent anticancer agent.
Novel 2,2-Bipyridine Ligand for Palladium-Catalyzed Regioselective Carbonylation
[GRAPHICS]A palladium-catalyzed highly regioselective one-step carbonylation of 2,5-dibromo 3-methylpyridine is reported. A range of alkyl esters and amides can be prepared in good yield with better than 95:5 regioselectivity via this method. Key to the high regioselectivity for the formation aromatic amides is the introduction of a novel nonphosphine based 2,2 bipyridine ligand, This novel reaction was scaled up smoothly in the plant to a 130-kg batch size and facilitated the delivery of bulk material for the clinical trials of Sch 66336, a candidate for oncologic treatments.
SYNTHESIS OF INTERMEDIATES USEFUL IN PREPARING TRICYCLIC COMPOUNDS
申请人:SCHERING CORPORATION
公开号:EP0977739B1
公开(公告)日:2003-10-29
Structure–activity relationship study to improve cytotoxicity and selectivity of lonafarnib against breast cancer cells
作者:Siriwat Hongnak、Ronald Gust
DOI:10.1002/ardp.202200263
日期:——
unselective activity and high cytotoxicity against nonmalignant cells. Therefore, we structurally modified the terminal 4-methylpiperidine-1-carboxamide residue of lonafarnib and evaluated the antiproliferative effects of the resulting derivatives in Michigan Cancer Foundation - 7 (MCF-7) breast cancer cells as well as simian virus 80 (SV-80) fibroblasts. The highest cytotoxicity against both cell lines