已经开发出第一个钯催化的仲醇对映选择性氧化反应,利用容易获得的二胺(-)-金雀花石作为手性配体,分子氧作为化学计量氧化剂。关于碱基和氢键供体作用的机制见解导致了对原始系统的一些改进。也就是说,碳酸铯和叔丁醇的添加大大提高了反应速率,促进了快速分辨率。使用氯仿作为溶剂允许在 23 °C 下使用环境空气作为终端氧化剂,从而提高催化剂选择性。这些改进的反应条件使得能够以良好至优异的选择性因子成功地将苄基、烯丙基和环丙基仲醇动力学拆分为高对映体过量。该催化剂体系也已应用于内消旋二醇的去对称化,提供高产率的对映体富集的羟基酮。
[EN] BETUIN DERIVATIVES FOR PREVENTING OR TREATING HIV INFECTIONS<br/>[FR] DÉRIVÉS DE BÉTUINE PERMETTANT DE PRÉVENIR OU DE TRAITER DES INFECTIONS À VIH
申请人:GLAXOSMITHKLINE INTELLECTUAL PROPERTY (NO 2) LTD
公开号:WO2017017607A1
公开(公告)日:2017-02-02
The present invention relates to compounds characterized by having a structure according to the following Formula (I), or a pharmaceutically acceptable salt thereof. Compounds of the present invention are useful for the treatment or prevention of HIV.
本发明涉及具有如下式(I)结构的化合物,或其药用可接受盐。本发明的化合物用于治疗或预防HIV。
Construction of polycyclic structures with vicinal all-carbon quaternary stereocenters <i>via</i> an enantioselective photoenolization/Diels–Alder reaction
present in one molecule, they will dramatically increase its synthetic challenge. A chiral titanium promoted enantioselective photoenolization/Diels–Alder (PEDA) reaction allows largely stereohindered tetra-substituted dienophiles to interact with highly active photoenolized hydroxy-o-quinodimethanes, delivering fused or spiro polycyclic rings bearing vicinal all-carbon quaternary centers in excellent
An efficient synthesis of 2-substituted cyclopentenones is reported. Key reactions are the cylopropanation of 2,2-dimethyl-3(2H)-furanone and subsequent conversion to the title compounds by oxidative fragmentation.
Reductive cyclizations of allenic ketones by dissolving metals
作者:Jack K Crandall、Maher Mualla
DOI:10.1016/s0040-4039(00)84497-4
日期:——
The dissolving metal reductions of certain allenic carbonyl compounds leads to the formation of cyclic alcohols with high regioselectivity.
某些烯丙基羰基化合物的溶解性金属还原导致形成具有高区域选择性的环状醇。
Catalytic Asymmetric Total Synthesis of (+)-Lactacystin
作者:Nobuhisa Fukuda、Kazuki Sasaki、T. V. R. S. Sastry、Motomu Kanai、Masakatsu Shibasaki
DOI:10.1021/jo0524223
日期:2006.2.1
Total synthesis of (+)-lactacystin, a potent and selective proteasome inhibitor, was accomplished using a catalytic enantioselective Strecker reaction of a ketoimine as the initial key step. An enone-derived N-phosphinoyl ketoimine 7 was selected as a stable masked α-hydroxy ketoimine analogue. Excellent enantioselectivity (98% ee) and practical catalyst activity were produced under the optimized catalyst