Asymmetric Synthesis of Fluorinated Allenes by Rhodium‐Catalyzed Enantioselective Alkylation/Defluorination of Propargyl Difluorides with Alkylzincs
作者:Jia Sheng Ng、Tamio Hayashi
DOI:10.1002/anie.202109290
日期:2021.9.13
The reaction of propargyl difluorides R1CF2C≡CR2 with alkylzincs R3ZnCl giving axially chiral fluorinated allenes R1FC=C=CR2R3 with high enantioselectivity (up to 99 % ee) was found to be catalyzed by a chiral diene/rhodium complex. A key step in the catalytic cycle is selective elimination of one of the enantiotopic fluorides at the β-position of an alkenyl-Rh intermediate, which is generated by regioselective
发现炔丙基二氟化物 R 1 CF 2 C≡CR 2与烷基锌 R 3 ZnCl 的反应得到具有高对映选择性(高达 99 % ee)的轴向手性氟化丙二烯 R 1 FC=C=CR 2 R 3手性二烯/铑配合物。催化循环中的一个关键步骤是选择性消除烯基-Rh 中间体 β 位的一种对映氟化物,它是通过将 R 3 -Rh区域选择性加成到起始二氟化物的三键上而产生的。
Restricted rotation due to the lack of free space within a capsule translates into product selectivity: photochemistry of cyclohexyl phenyl ketones within a water-soluble organic capsule
The rotational mobility of organic guest molecules when included within a confined capsule is restricted and this feature could be translated into product selectivity as established with the photochemical behavior of cyclohexyl phenyl ketones.
Bisphenyl compounds useful as vitamin D3 receptor agonists
申请人:Wallace David
公开号:US20060025474A1
公开(公告)日:2006-02-02
The present invention discloses bisphenyl compounds of the formula:
wherein R1, R2, R3, R4, R5, R6, X, Y, W are defined herein after. These compounds are useful as pharmaceuticals.
The present invention relates to the use of novel pyrrolopyrazine derivatives of Formula I,
wherein the variables Q
1
, R, and X are defined as described herein, which inhibit JAK and SYK and are useful for the treatment of auto-immune and inflammatory diseases.
Site‐selective Hydrogenation/Deuteration of Benzylic Olefins Enabled by Electroreduction Using Water
作者:Simon Kolb、Daniel B. Werz
DOI:10.1002/chem.202300849
日期:——
Electroreduction of benzylicolefins has been applied to site-selectively hydrogenate such double bonds while other functions that react under regular hydrogenation conditions are present. By the use of water as proton source this protocol also allows deuteration by simply switching to D2O. The applicability of this method was shown by the use of a commercially available electrolysis setup and a broad
苄基烯烃的电还原已应用于位点选择性氢化此类双键,同时存在在常规氢化条件下反应的其他功能。通过使用水作为质子源,该协议还允许通过简单地切换到 D 2 O 进行氘化。该方法的适用性通过使用商用电解装置和广泛的底物范围得到证明。