ATP-citrate-lyase as a target for hypolipidemic intervention. Sulfoximine and 3-hydroxy-.beta.-lactam containing analogs of citric acid as potential tight-binding inhibitors
摘要:
Citric acid analogues (+/-)-12a,b and (+/-)-17a,b, where one of the primary carboxylates has been replaced by a sulfoximinoyl and a 3-(3-hydroxy-beta-lactamyl) moiety, respectively, have been synthesized and evaluated as inhibitors of ATP-citrate lyase. The design of these inhibitors was based on methionine sulfoximine and tabtoxinine beta-lactam, potent, tight-binding inhibitors of glutamine synthetase. Both ATP-citrate lyase and glutamine synthetase employ phosphate-carboxylate anhydrides as a method for carboxylate activation during catalysis. Only one diastereomer, (+/-)-12a, displayed weak, reversible inhibition, while the remaining citrate analogues (+/-)-12b and (+/-)-17a,b were inactive against the lyase. No time-dependent inactivation of the enzyme was observed.
1,3-dipolar cycloaddition of benzonitrile oxide with vinylsilanes
作者:Albert Padwa、J.Gavin MacDonald
DOI:10.1016/s0040-4039(00)87574-7
日期:1982.1
The reaction of benzonitrileoxide with several vinylsilanes has been found to afford silylated isoxazoles. Relative rates for the cycloaddition reaction were determined.
已经发现苯甲腈氧化物与几种乙烯基硅烷的反应提供了甲硅烷基化的异恶唑。确定了环加成反应的相对速率。
SYNTHESES AND POLYMERIZATION OF α-TRIMETHYLSILYL ACRYLIC MONOMERS
作者:Ariel Ottolenghi、Mati Fridkin、A. Zilkha
DOI:10.1139/v63-437
日期:1963.12.1
2-dibromoethyltrimethylsilane. These monomers were polymerized with difficulty by freeradicals to viscous polymers, but gave solid copolymers with styrene. The methyl ester was also a weak monomer in anionic polymerization. This non-reactivity is due to the steric effect of the α-trimethylsilyl groupadjacent to the doublebond.