An efficient palladium catalyzed Mizoroki–Heck cross-coupling in water
作者:Sanjay N. Jadhav、Chandrashekhar V. Rode
DOI:10.1039/c7gc02869e
日期:——
Pd-catalysed Mizoroki–Heck coupling reaction was successfully performed in water in the absence of any additives under aerobic conditions. The various key reaction parameters that affect the yield of the desired cross-coupling product were optimized. The Pd(PPh3)4/Et3N/H2O/98 °C catalyst system was found to be highly active (TOF = 12 to 14 h−1) towards achieving excellent yield of the Mizoroki–Heck coupling
在有氧条件下,在没有任何添加剂的情况下,水中成功地进行了均相Pd催化的Mizoroki-Heck偶联反应。优化了影响所需交叉偶联产物收率的各种关键反应参数。发现Pd(PPh 3)4 / Et 3 N / H 2 O / 98°C催化剂体系具有很高的活性(TOF = 12至14 h -1),可实现出色的Mizoroki–Heck偶联产物的收率。在最短的反应时间内,吸电子以及给电子的芳基溴化物和氯化物种类繁多。钯(PPh 3)4对Mizoroki-Heck偶联反应过程中的催化剂失活进行了研究,并发展了实现十倍Pd-金属可循环性而又没有明显损失其活性的策略。因此,提出的机制提供了在水性介质中接触各种烯烃的途径,从而使该协议变得环保。
Enantioselective Synthesis of β‐Amino Acid Derivatives Enabled by Ligand‐Controlled Reversal of Hydrocupration Regiochemistry
作者:Sheng Guo、Jiaqi Zhu、Stephen L. Buchwald
DOI:10.1002/anie.202007005
日期:2020.11.16
A Cu‐catalyzed enantioselective hydroamination of α,β‐unsaturated carbonyl compounds for the synthesis of β‐amino acid derivatives was achieved through ligand‐controlled reversal of the hydrocupration regioselectivity. While the hydrocupration of α,β‐unsaturated carbonyl compounds to form α‐cuprated species has been extensively investigated, we report herein that, in the presence of an appropriate
Asymmetric dehydration of β-hydroxy esters via kinetic resolution
作者:Yongtae Kim、Eui Ta Choi、Min Hee Lee、Yong Sun Park
DOI:10.1016/j.tetlet.2007.02.111
日期:2007.4
Catalytic asymmetricdehydration of β-hydroxyesters via kineticresolution has been investigated. The kineticresolution of rac-β-hydroxy esters in the presence of prolinol chiral ligand 2a and BrZnCH2CO2t-Bu can provide highly enantioenriched β-hydroxyesters 3 and 5–11 with selectivity factors ranging from 15 to 42.
已经研究了通过动力学拆分对β-羟基酯进行催化不对称脱水的方法。的动力学拆分外消旋-β-羟基酯在存在脯氨醇手性配体2A和BrZnCH 2 CO 2吨-Bu能够提供对映体富集的高度β羟基酯3和5 - 11有选择性因素,从15至42。
RESIN COMPOSITION AND OPTICAL COMPENSATION FILM USING SAME
申请人:Tosoh Corporation
公开号:EP3208301A1
公开(公告)日:2017-08-23
To provide a resin composition suitable for an optical compensation film, an optical compensation film using the same, which is excellent in the retardation characteristics and wavelength dispersion characteristics, and a production method of an optical compensation film.
A resin composition containing, as resin components, from 30 to 99 wt% of a cellulose-based resin represented by the following formula (1) and from 1 to 70 wt% of a cinnamic acid ester copolymer.
(wherein each of R1, R2 and R3 independently represents hydrogen or a substituent having a carbon number of 1 to 12).
Resin composition and optical compensation film using same
申请人:TOSOH CORPORATION
公开号:US10126478B2
公开(公告)日:2018-11-13
A resin composition suitable for an optical compensation film, an optical compensation film using the same, which is excellent in the retardation characteristics and wavelength dispersion characteristics, and a production method of an optical compensation film. A resin composition containing, as resin components, from 30 to 99 wt % of a cellulose-based resin represented by the following formula (1) and from 1 to 70 wt % of a cinnamic acid ester copolymer:
where each of R1, R2 and R3 independently represents hydrogen or a substituent having a carbon number of 1 to 12.