The present invention is directed to α-ketoamide derivatives, pharmaceutical compositions containing them and their use in the treatment of disorders and conditions modulated by endothelial lipase, for example, cardiovascular disorders.
A Novel Transition Metal-Catalyzed Route to Functionalized Dihydropyrans and Tetrahydrooxepines
作者:Floris P. J. T. Rutjes、T. Martijn Kooistra、Henk Hiemstra、Hans E. Schoemaker
DOI:10.1055/s-1998-1598
日期:1998.2
A straightforward route for the synthesis of α,α'-disubstituted dihydropyrans and tetrahydrooxepines has been developed involving Pd- and Ru-catalyzed reactions.
Chiral titaniumcomplex (1), prepared in situ from optically pure binaphthol and diisopropoxytitanium dihalide in the presence of molecular sieves, is shown to catalyze the additionreactions of crotylsilanes and -stannanes to glyoxylates to afford (syn)-α-hydroxy-β-methyl esters in highly scalemic forms with high diastereoselectivity.
Ring-Closing Metathesis of Allylic O,O- and N,O-Acetals
作者:Sape S. Kinderman、Robin Doodeman、Jetze W. van Beijma、Jaap C. Russcher、Kim C. M. F. Tjen、T. Martijn Kooistra、Homayun Mohaselzadeh、Jan H. van Maarseveen、Henk Hiemstra、Hans E. Schoemaker、Floris P. J. T. Rutjes
A variety of allylic O,O -a ndN,O-acetals were synthesized using a mild palladium-catalyzed coupling of an alcohol or sulfonamide with an alkyl or aryl 1,2-propadienyl ether. The resulting linear acetals were used for the synthesis of unsaturated ringsvia ring-closing metathesis, in which the acetal carbon ± a precursor for oxycarbenium or N-sulfonyliminium ions, respectively ± served as a reactive
使用醇或磺酰胺与烷基或芳基 1,2-丙二烯基醚的温和钯催化偶联合成了各种烯丙基 O,O -a ndN,O-缩醛。所得线性缩醛用于通过闭环复分解合成不饱和环,其中缩醛碳±氧碳鎓或 N-磺酰亚胺鎓离子的前体分别±充当进一步引入官能团的反应中心。产物——不饱和氧和氮杂环支架——为衍生提供了多种机会,如取代二氢吡喃、色烯、对映体纯四氢吡啶和对映体纯的喹啉氨基酸的合成所示。
Synthetic Studies of a Didemnin B Analog Based on a 2,3-Diamino Sugar Scaffolding
作者:Joshi M. Ramanjulu、Madeleine M. Joullié、Wen-Ren Li
DOI:10.1002/jccs.200100001
日期:2001.2
esterification via DCC (dicyclohexylcarbodiimide) were the key synthetic steps to generate an advanced intermediate in the preparation of a didemninBanalog based on a sugar scaffolding (2). This analog should provide insight into the bioactive conformation of didemninB.
还原胺化、使用 BOP [(1H-1,2,3-benzotriazol-1-yloxy)tris(dimethylamino)-phosphonium hexafluorophosphate] 形成酰胺和通过 DCC(二环己基碳二亚胺)酯化是生成高级中间体的关键合成步骤。基于糖脚手架的二甲胺 B 类似物的制备 (2)。这种类似物应该可以深入了解 didemnin B 的生物活性构象。