Effects of Methyl Substituents on the Activity and Enantioselectivity of Homobenzotetramisole-Based Catalysts in the Kinetic Resolution of Alcohols [0.03%]
甲基取代对同系苯并四氨咪唑类催化剂在手性仲醇动态动力学拆分中的活性及enantioselectivity的影响研究
Yuhua Zhang,Vladimir B Birman
Yuhua Zhang
Substitution of the tetrahydropyrimidine ring in enantioselective acyl transfer catalyst homobenzotetramisole (HBTM) 6 with methyl groups exerts a dramatic influence on its performance in the kinetic resolution of secondary alcohols. Syn-3-...
Catalytic Asymmetric Synthesis of Branched Chiral Allylic Phenyl Ethers from (E)-Allylic Alcohols [0.03%]
E型烯丙醇的催化不对称合成分支型手性烯丙基苯醚化合物
Angela C Olson,Larry E Overman,Helen F Sneddon et al.
Angela C Olson et al.
The first di-μ-amidate dipalladium complexes and a new di-μ-carboxylate dipalladium complex of the COP (cobalt oxazoline palladacycle) palladium(II) catalyst family are reported and characterized crystallographically. The di-μ-amidate co...
A Novel Bis-Thiourea Organocatalyst for the Asymmetric Aza-Henry Reaction [0.03%]
用于不对称氮亨利反应的新型双硫脲有机催化剂
Constantinos Rampalakos,William D Wulff
Constantinos Rampalakos
A novel bis-thiourea BINAM-based catalyst for the asymmetric aza-Henry reaction has been developed. This catalyst promotes the reaction of N-Boc imines with nitroalkanes to afford β-nitroamines with good yields and high enantioselectivitie...
Substituent Effect on the Formation and Their Reactivity of Platinum Carbenoids [0.03%]
取代基效应与铂碳烯的生成及其反应性关系研究
Eun Jin Cho,Daesung Lee
Eun Jin Cho
A propargylic ester containing a propargylic alkoxy group has been observed to preferentially undergo [1,2]-acyl shift over [1,3]-shift. In addition, the complementary and contrasting reactivity of vinyl vs. alkynyl platinum carbenoids has ...
Efficient and General Synthesis of 3-Aminoindolines and 3-Aminoindoles via Copper-Catalyzed Three Component Coupling Reaction [0.03%]
一种有效的合成3-氨基吲哚啉和3-氨基吲哚的三组分偶联反应方法
Dmitri Chernyak,Natalia Chernyak,Vladimir Gevorgyan
Dmitri Chernyak
An efficient three component coupling (TCC) reaction toward a variety of 3-aminoindoline and 3-aminoindole derivatives has been developed. This cascade transformation proceeds via the copper-catalyzed coupling reaction between 2-aminobenzal...
Studies Toward the Synthesis of (-)-Zampanolide: Preparation of the Macrocyclic Core [0.03%]
(-)-Zampanolide合成研究：宏环核心结构的构建
Dawn M Troast,Jiayi Yuan,John A Porco Jr
Dawn M Troast
Studies towards the synthesis of the macrocyclic core of (-)-zampanolide are reported. The synthetic approach features a one-pot reduction/vinylogous aldol reaction for construction of the C15-C20 fragment, an intramolecular silyl-modified ...
An Improved Synthesis of BrettPhos and RockPhos-Type Biarylphosphine Ligands [0.03%]
改进的BrettPhos和RockPhos型联芳基膦配体合成方法
Naoyuki Hoshiya,Stephen L Buchwald
Naoyuki Hoshiya
Improved processes for the preparation of biphenyl-based phosphine ligands t-BuBrettPhos, RockPhos, and BrettPhos are presented. The new methods, featuring the use of Grignard reagents and catalytic amounts of copper, are superior to the pr...
Exploiting Acyl and Enol Azolium Intermediates via NHeterocyclic Carbene Catalyzed Reactions of Alpha-Reducible Aldehydes [0.03%]
通过氮杂环卡宾催化可还原醛的反应利用酰基和烯醇重氮𬭩中间体
Harit U Vora,Philip Wheeler,Tomislav Rovis
Harit U Vora
N-heterocyclic carbenes are well known for their role in catalyzing benzoin and Stetter reactions: the generation of acyl anion equivalents from simple aldehydes to react with a variety of electrophiles. However, when an aldehyde bearing a ...
Selective Autooxidation of Ethanol over Titania-Supported Molybdenum Oxide Catalysts: Structure and Reactivity [0.03%]
负载钼氧化物的选择性乙醇氧化及其结构和反应性能关系研究
Carlos Caro,K Thirunavukkarasu,M Anilkumar et al.
Carlos Caro et al.
We study the selective catalytic oxidation of ethanol with air as a sustainable alternative route to acetaldehyde. The reaction is catalysed by molybdenum oxide supported on titania, in a flow reactor under ambient pressure. High selectivit...
Tina Gerhards,Ursula Mackfeld,Marco Bocola et al.
Tina Gerhards et al.
The asymmetric mixed carboligation of aldehydes with thiamine diphosphate (ThDP)-dependent enzymes is an excellent example where activity as well as changes in chemo- and stereoselectivity can be followed sensitively. To elucidate the influ...