Three convergent routes to thiophenes are described, hinging on the radical addition of alpha-xanthyl ketones to ethyl vinyl sulfide or to vinyl pivalate. The latter route ultimately proved to be the most versatile and efficient (61-94%).
Chemists devote tremendous effort to the precise placement of oxygens in molecular frameworks. Wu
et al
. report a convenient method to shift the oxygen in a carbonyl group to an adjacent carbon center. After activation of the oxygen to an alkenyl triflate, cooperative catalysis by palladium and norbornene adds nitrogen to the neighboring carbon while displacing the triflate with hydride. Hydrolysis then produces the desired shifted ketone. The protocol is well suited to late-stage variation of complex molecules during drug optimization. —JSY
Quinoline and naphthyridine carboxylic acid antibacterials
申请人:——
公开号:US20020049223A1
公开(公告)日:2002-04-25
Compounds having formula (I)
1
or pharmaceutically acceptable salts or prodrugs thereof, are useful as antibacterial agents.
具有化学式(I)1的化合物或其药用可接受的盐或前药,可用作抗菌剂。
Synthesis in the diazasteroid group. XII Syntheses of the 10,17-diazasteroid and 10-aza-17-thiasteroid systems
作者:Hiroki Takahata、Misao Hara、Akira Tomiguchi、Takao Yamazaki、Raymond N. Castle
DOI:10.1002/jhet.5570170241
日期:1980.3
the condensed heterocycles 2a,b prepared by cyclization from β-ketosulfoxides 1a,b gave β-ketones 3a,b, which were condensed with 2-carbethoxymethyl-piperidine 4 to afford the 10,17-diazasteroid 6 and the 10-aza-17-thiasteroid 7, respectively.
Improvements in or relating to benzothienylglycyl cephalosporin derivatives
申请人:ELI LILLY AND COMPANY
公开号:EP0122156A2
公开(公告)日:1984-10-17
7-(2-Benzothienyl)glycylamido cephalosporins provided by this invention possess favorable pharmacokinetics and are orally-effective against gram positive bacteria.