Polysiloxane-Supported NAD(P)H Model 1-Benzyl-1,4-dihydronicotinamide: Synthesis and Application in the Reduction of Activated Olefins
作者:Baolian Zhang、Xiao-Qing Zhu、Jin-Yong Lu、Jiaqi He、Peng G. Wang、Jin-Pei Cheng
DOI:10.1021/jo020319x
日期:2003.4.1
A new polysiloxane-supported NAD(P)Hmodel, 1-benzyl-1,4-dihydronicotinamide, was designed and synthesized, which can efficiently reduce many activated olefins under mild conditions. The most advantageous features of this new polysiloxane-supported reductant are (i) easy workup and separation of the reaction products and (ii) good potential for recycling use of the reductant, which makes this new
Measurement of pK a values for phosphonium salts via the kinetics of proton transfer to an electrogenerated base
作者:Sim Ling-Chung、Keith D. Sales、James H. P. Utley
DOI:10.1039/c39900000662
日期:——
pKa values have for the first time been measured for common phosphonium ions, including butyl-, allyl-, prop-2-ynyl- and benzyl-triphenylphosphonium, by comparison through a linear Brønsted plot of their rates of protontransfer to an electrogeneratedbase with those involving carbon acids of known acidity.
通过对质子转移至电生成速率的线性布朗斯台德曲线进行比较,首次测量了常见的离子(包括丁基,烯丙基,丙-2-炔基和苄基三苯基phosph)的p K a值含已知酸度的碳酸的碱。
Novel Process for the Synthesis of Class I Antiarrhythmic Agent (±)-Cibenzoline and Its Analogs
作者:Atul R. Gholap、Vincent Paul、Kumar V. Srinivasan
DOI:10.1080/00397910802006388
日期:2008.8.18
Abstract Synthesis of (±)-cibenzoline and its analogs has been achieved by a simple sequence of reactions. The diaryl cyanoolefin intermediate 3 could be prepared by Knoevenagel condensation of benzophenone with ethylcyanoacetate to form the tetra-substituted olefinintermediate 2 followed by Krapcho deethoxycarbonylation or from β-hydroxynitrile intermediate 2′ followed by the elimination of hydroxyl
A hydride transfer reaction from salts of carbanions to activated olefins
作者:Ben-Ami Feit、Sarit Shapira、Amatzya Herbst
DOI:10.1016/0040-4020(94)00949-u
日期:1995.1
A novel reaction - a β-elimination of a hydride ion from carbanion salts RM (R = Li, MgBr) and R2N−Li+, and its transfer to tetra-substituted activated olefins of the type Ar2C=C(CN)CO2R (R=Me,Et), was studied. Yields of the reduced H−-acceptor were used to follow the extent of the H−-transfer reaction. A competing Michael addition reaction of RM to the activated olefin also took place. The effects
一种新的反应-从碳负离子盐RM(R = Li,MgBr)和R 2 N - Li +中消除氢离子,并将其转移到Ar 2 C = C(CN)型四取代的活化烯烃中研究了)CO 2 R(R = Me,Et)。减小的H的产量-端受体被用来按照H的程度- -转移反应。RM与活化烯烃的竞争性迈克尔加成反应也发生了。溶剂,反应温度,正抗衡离子和的,将H的各种结构特征的溶剂化性能的影响-端供体和H --受体,进行了研究。由于反应的双分子性,与两种反应物有关的结构因素起着至关重要的作用。在RM,次甲基型β碳,或RM的R的小尺寸的Çβ甲苄基取代基,导致在H的相对高的程度- -转移反应。这表明,目前研究的氢离子的β-消除作用是通过双分子E 2 cB型机制产生的。
New Reaction of Fullerene C60 with Cyanoacrylates and Ethylmagnesium Bromide in the Presence of Titanium(IV) Isopropoxide
Abstract The reaction of fullerene C60 with cyanoacrylates and ethylmagnesiumbromide in the presence of stoichiometric amounts of titanium(IV) isopropoxide was studied for the first time. Under the developed conditions, cyanoacrylates, unlike carboxylic acid esters and nitriles, were found to react with C60 to form aminofullerocyclopropanes, which are otherwise difficult to access. The reaction of fullerene