Highly Enantioselective Henry Reactions in Water Catalyzed by a Copper Tertiary Amine Complex and Applied in the Synthesis of (S)-N-trans-Feruloyl Octopamine
作者:Guoyin Lai、Fengfeng Guo、Yueqin Zheng、Yang Fang、Haigang Song、Kun Xu、Sujing Wang、Zhenggen Zha、Zhiyong Wang
DOI:10.1002/chem.201002915
日期:2011.1.24
It's in the water! A new coppertertiaryaminecomplex was prepared and applied in asymmetric Henryreactions in water and in the short synthesis of (S)‐N‐trans‐feruloyl octopamine. This catalytic system provided an approach to the enantioselectiveHenryreaction of aldehydes with hydroxyl substituents (see graphic).
Chiral Zirconium Catalysts Using Multidentate BINOL Derivatives for Catalytic Enantioselective Mannich-Type Reactions; Ligand Optimization and Approaches to Elucidation of the Catalyst Structure
Catalytic enantioselective Mannich-type reactions of silicon enolates with aldimines were investigated using chiral zirconium catalysts prepared from Zr(O(t)Bu)(4), N-methylimidazole, and newly designed multidentate BINOL derivatives. These new multidentate BINOL ligands were designed on the basis of an assumed transition state structure of a chiral zirconium catalyst derived from two molecules of
High Enantioselectivities in an (<i>E</i>)-Alkene Epoxidation by Catalytically Active Chromium Salen Complexes. Insight into the Catalytic Cycle
作者:Adrian M. Daly、Marie F. Renehan、Declan G. Gilheany
DOI:10.1021/ol0069406
日期:2001.3.1
[structure: see text]. The epoxidation of (E)-beta-methylstyrene mediated by an oxochromium salen complex yields the epoxide in 92% ee in stoichiometric mode, the highest ee yet reported for a metal-mediated epoxidation of an (E)-alkene. The effect of added donor ligands, previously substantial, has reached a ceiling with this complex. In catalytic mode a slightly reduced ee and higher yield is obtained
[EN] TRPV1 ANTAGONISTS<br/>[FR] ANTAGONISTES DE TRPV1
申请人:ABBOTT LAB
公开号:WO2010045401A1
公开(公告)日:2010-04-22
Disclosed herein are compounds of Formula (I), or pharmaceutically acceptable salts, solvates, prodrugs, salts of prodrugs, or combinations thereof, wherein R1, R2, R3, R4, and m are defined in the specification. Compositions comprising such compounds and methods for treating conditions and disorders using such compounds and compositions are also disclosed.
deprotonation occurs at the position adjacent to the O when butyllithium is employed whereas the position adjacent to the F is attacked by the superbasic mixt. of butyllithium and K tert-butoxide (LIC-KOR). The MOM-protected (trifluoromethyl)phenols react exclusively at O-neighboring positions. The meta isomer provides another example of optional site selectivity, undergoing H/metal exchange at the 2-position
O-甲氧基甲基 (MOM) 保护的氟酚类可以完全金属化,然后进行位点选择性亲电取代。2-和4-异构体表现出矛盾的反应性:当使用丁基锂时,在与 O 相邻的位置发生去质子化,而与 F 相邻的位置受到超碱性混合物的攻击。丁基锂和叔丁醇钾 (LIC-KOR)。MOM 保护的(三氟甲基)苯酚仅在 O 邻位发生反应。间位异构体提供了另一个可选位点选择性的例子,在 2-位与 LIC-KOR 试剂进行 H/金属交换,在 6-位与仲丁基锂进行交换。未保护的(三氟甲基)苯酚也可以在 O-去质子化后进行邻位金属化,尽管生成的产物产率适中。[在 SciFinder (R) 上]