ANTHELMINTIC COMPOUNDS AND COMPOSITIONS AND METHOD OF USING THEREOF
申请人:Meng Charles Q.
公开号:US20140142114A1
公开(公告)日:2014-05-22
The present invention relates to novel anthelmintic compounds of formula (I) below:
wherein
Y and Z are independently a bicyclic carbocyclic or a bicyclic heterocyclic group, or one of Y or Z is a bicyclic carbocyclic or a bicyclic heterocyclic group and the other of Y or Z is alkyl, alkenyl, alkynyl, cycloalkyl, phenyl, heterocyclyl or heteroaryl, and variables X
1
, X
2
, X
3
, X
4
, X
5
, X
6
, X
7
and X
8
are as defined herein. The invention also provides for veterinary compositions comprising the anthelmintic compounds of the invention, and their uses for the treatment and prevention of parasitic infections in animals.
The asymmetric catalytic addition of alcohols (phenols) to non‐activated alkenes has been realized through the cycloisomerization of 2‐allylphenols to 2‐methyl‐2,3‐dihydrobenzofurans (2‐methylcoumarans). The reaction was catalyzed by a chiral titanium–carboxylate complex at uncommonly hightemperatures for asymmetric catalytic reactions. The catalyst was generated by mixing titanium isopropoxide, the
H2‐O‐T! Aromatic O‐heterocycles are a challenging substrates for asymmetrichydrogenation (H2). An in situ formed chiral N‐heterocyclic carbene (NHC) ruthenium complex allows the high yielding, completely regioselective, and highlyasymmetrichydrogenation of substituted benzofurans at room Temperature, giving valuable 2,3‐dihydrobenzofurans (see scheme).
H 2 ‐O‐T!芳族O杂环是不对称氢化(H 2)的具有挑战性的底物。原位形成的手性N-杂环卡宾(NHC)钌络合物可在T温度下以高收率,完全区域选择性和高度不对称氢化取代苯并呋喃,得到有价值的2,3-二氢苯并呋喃(参见方案)。
Axially Chiral 1,1'‐Binaphthyl‐2‐Carboxylic Acid (BINA‐Cox) as Ligands for Titanium‐Catalyzed Asymmetric Hydroalkoxylation
作者:Sebastian L. Helmbrecht、Johannes Schlüter、Max Blazejak、Lukas Hintermann
DOI:10.1002/ejoc.201901895
日期:2020.4.16
1'‐biaryl‐2‐carboxylic acids, a catalyst for the asymmetric addition of phenolic hydroxyl to non‐activated alkene at hightemperature (240 °C) is formed. This work systematically develops scalable syntheses of variably decorated, enantiopure 1,1'‐biaryl‐2'‐carboxylic acids, which are then tested as steering ligands in intramolecular asymmetric catalytic hydroalkoxylation reactions.
Asymmetric Retro-Claisen Reaction by Chiral Primary Amine Catalysis
作者:Yunbo Zhu、Long Zhang、Sanzhong Luo
DOI:10.1021/jacs.6b00627
日期:2016.3.30
The communication describes an enamine-based asymmetric retro-Claisen reaction of β-diketones by primaryamine catalysis. The reaction proceeds via a sequence of stereoselective C-C formation, C-C cleavage, and a highly stereospecific enamine protonation to afford chiral α-alkylated ketones or macrolides with high yields and enantioselectivities. A detailed mechanism was explored on the basis of experimental
该通讯描述了伯胺催化下 β-二酮的基于烯胺的不对称逆克莱森反应。该反应通过一系列立体选择性 CC 形成、CC 裂解和高度立体有择的烯胺质子化进行,以提供具有高产率和对映选择性的手性 α-烷基化酮或大环内酯。在实验证据和计算研究的基础上探索了详细的机制,以解释观察到的立体控制。