The catalytic asymmetric methylation of fluoroalkylated pyruvates is shown with dimethylzinc as a methylating reagent in the presence of a copper catalyst bearing a chiral phosphine ligand. This is the first catalytic asymmetric methylation to synthesize various α-fluoroalkylated tertiary alcohols with CF3, CF2H, CF2Br, and n-C n F2n+1 (n = 2, 3, 8) groups in good-to-high yields and enantioselectivities
在带有手性膦配体的铜催化剂存在下,用二甲基锌作为甲基化试剂显示了氟代烷基化丙酮酸的催化不对称甲基化。这是第一个催化不对称甲基化反应,以高至高收率和对映选择性合成具有CF3,CF2H,CF2Br和nC n F2n + 1(n = 2、3、8)基团的各种α-氟烷基化叔醇。手性膦配体的磷原子上的轴向骨架和取代基严重影响对映选择性。此外,发现仅通过手性膦而不使用铜可以促进简单的全氟烷基化的酮的甲基化。
Synthesis of Optically Pure 2-Trifluoromethyl Lactic Acid by Asymmetric Hydroformylation
作者:Xiao Wang、Stephen L. Buchwald
DOI:10.1021/jo400115r
日期:2013.4.5
ligated by the P-chirogenic ligands QuinoxP* and DuanPhos, 3,3,3-trifluoroprop-1-en-2-yl acetate could be hydroformylated and subsequently oxidized to yield enantiomerically pure 2-trifluoromethyllactic acid.
Self-disproportionation of enantiomers of α-trifluoromethyl lactic acid amides via sublimation
作者:Manabu Yasumoto、Hisanori Ueki、Vadim A. Soloshonok
DOI:10.1016/j.jfluchem.2009.11.010
日期:2010.4
subjected to sublimation under kinetic conditions (Petri dish in open air), the enantiomeric excess of the remainder has noticeably increased. On the other hand, the SDE of Bn amide derivative by sublimation resulted in almost no change in the optical purity of the remainder. These preliminary results on the SDE of the compounds understudy, as well as their excellent chemical and physico-chemical characteristics
已经开发了外消旋和对映体富集的α-三氟甲基乳酸酰胺[NHPh,NH(4-Cl-C 6 H 5),NHBn,NH t -Bu ]衍生物的制备。发现Ph,4-Cl-C 6 H 5和叔-Bu衍生物通过升华具有相当大的对映体自歧化度(SDE)。例如,当光学富集的Ph,4-Cl-C 6 H 5和叔-Bu酰胺衍生物在动力学条件下(露天培养皿)升华,剩余的对映体过量显着增加。另一方面,通过升华的Bn酰胺衍生物的SDE几乎没有改变其余部分的光学纯度。对所研究化合物的SDE的这些初步结果,以及其优异的化学和物理化学特性,使得这些酰胺衍生物易于获得,并且对于通过升华进行SDE的系统研究而言,是非常有前途的底物。
Novel Pharmaceutical Compounds
申请人:Blouin Marc
公开号:US20090227638A1
公开(公告)日:2009-09-10
The instant invention provides compounds of Formula (Ia) which are leukotriene biosynthesis inhibitors, wherein X is O or S, Y is O, S, —NR
6
—CHR
7
— or —NR
8
—C(O)— and A is selected from 5-membered aromatic heterocyclic ring, 6-membered aromatic heterocyclic ring, naphthelenic or heterobicyclic aromatic ring system, phenyl and benzyl. A is optionally mono- or disubstituted. Compounds of Formula (Ia) are useful as anti-atherosclerotic, anti-asthmatic, anti-allergic, anti-inflammatory and cytoprotective agents.
The instant invention provides compounds of Formula Ia which are leukotriene biosynthesis inhibitors.
Compounds of Formula Ia are useful as anti-atherosclerotic, anti-asthmatic, anti-allergic, anti-inflammatory and cytoprotective agents.