Catalytic enantioselective addition of hydrogen cyanide to benzaldehyde and p-methoxybenzaldehyde using cyclo-His-(α-Me)Phe as catalyst
摘要:
Two cyclo-dipeptides based on His and the unnatural (alpha Me)Phe have been examined as catalysts in the enantioselective addition of hydrogen cyanide to benzaldehyde and p-methoxy-benzaldehyde. The synthesis, catalytic activity and NMR study towards the mechanism of this reaction are presented. (C) 1997 Elsevier Science Ltd.
Catalytic enantioselective addition of hydrogen cyanide to benzaldehyde and p-methoxybenzaldehyde using cyclo-His-(α-Me)Phe as catalyst
摘要:
Two cyclo-dipeptides based on His and the unnatural (alpha Me)Phe have been examined as catalysts in the enantioselective addition of hydrogen cyanide to benzaldehyde and p-methoxy-benzaldehyde. The synthesis, catalytic activity and NMR study towards the mechanism of this reaction are presented. (C) 1997 Elsevier Science Ltd.
[EN] SMALL MOLECULE LEPTIN RECEPTOR MODULATORS<br/>[FR] MODULATEURS À PETITES MOLÉCULES DES RÉCEPTEURS DE LA LEPTINE
申请人:BIOVITRUM AB PUBL
公开号:WO2009147221A1
公开(公告)日:2009-12-10
The present invention relates to new compounds of formula (I), to pharmaceutical compositions comprising these compounds and to the use of these compounds as leptin receptor modulator mimetics in the preparation of medicaments against conditions associated with weight gain, type 2 diabetes and dyslipidemias.
we report an efficient protocol for the C(sp2)–H carbonylation of amino acid derivatives based on an inexpensive cobalt(II) salt catalyst. Carbonylation was accomplished using picolinamide as a tracelessdirectinggroup, CO (1 atm) as the carbonyl source, and Co(dpm)2 as the catalyst. A broad range of phenylalanine derivatives bearing diverse functional groups were tolerated. Moreover, the method can
A New Portal to SuFEx Click Chemistry: A Stable Fluorosulfuryl Imidazolium Salt Emerging as an “F−SO<sub>2</sub>
+” Donor of Unprecedented Reactivity, Selectivity, and Scope
作者:Taijie Guo、Genyi Meng、Xiongjie Zhan、Qian Yang、Tiancheng Ma、Long Xu、K. Barry Sharpless、Jiajia Dong
DOI:10.1002/anie.201712429
日期:2018.3.1
in highly functional molecules. We now report that a solid fluorosulfuryl imidazolium triflate salt delivers the same “F−SO2+” fragment to Nu−H acceptor groups in the substrates. However, this triflate salt is a far more reactive fluorosulfurylating agent than SO2F2 and displays selectivity preferences of its own. Moreover, the new azolium triflate reagent reacts once with primary amines and anilines
已经发现,硫酰氟SO 2 F 2在各种环境中,甚至在高功能分子中,都可以使苯酚衍生化。现在,我们报告固体三氟甲磺酸氟磺酰基咪唑鎓盐向底物中的Nu-H受体基团传递相同的“ F-SO 2 + ”片段。但是,这种三氟甲磺酸盐是一种比SO 2 F 2更具活性的氟磺化剂,并显示出其自身的选择性偏好。而且,在停止反应之前,新的三氟甲磺酸偶氮鎓试剂与伯胺和苯胺反应一次。另一方面,用三乙胺和两当量的“ F-SO 2 +“供体存在,它以良好的收率继续进行双(氟硫磺酰基)酰亚胺的转化-这是我们从未见过的两个重要的转化反应,我们将磺酰氟用作亲电试剂。
Synthesis of dipeptides containing α-substituted amino acids; their use as chiral ligands in Lewis-acid-catalyzed reactions
作者:Bernard Kaptein、Vania Monaco、Quirinus B. Broxterman、Hans E. Schoemaker、Johan Kamphuis
DOI:10.1002/recl.19951140417
日期:——
Ochrobactrum anthropi NCIMB 40321, was used in the synthesis of dipeptidescontainingα-substitutedaminoacids. The 2-hydroxynaphthalene-1-carboxaldehyde Schiff bases of the dipeptides (1 and 2) were tested as Ti(IV) and Al(III) complexes in asymmetric Lewis-acid-catalyzedreactions. Only the Al(III) complex of 2 showed moderate enantioselectivity in the cyanation reaction of benzaldehyde with TMS-CN.