Reaction of unsaturated compounds with ethyl benzenesulfenate and trimethylsilyl isothiocyanate
作者:N. V. Zyk、A. Yu. Gavrilova、O. A. Mukhina、A. A. Borisenko、O. B. Bondarenko、N. S. Zefirov
DOI:10.1007/s11172-010-0311-0
日期:2010.9
A new method for the synthesis of thiocyanato- and isothiocyanatoalkyl phenyl sulfides by the reaction of unsaturated compounds with ethyl benzenesulfenate and trimethylsilyl isothiocyanate has been suggested. Regio- and stereoselectivity of the reaction was studied, having taken alkenes, dienes, and alkynes as examples.
CpRuCl(PPh<sub>3</sub>)<sub>2</sub>-Catalyzed Cyclopropanation of Bicyclic Alkenes with Tertiary Propargylic Acetates
作者:Alphonse Tenaglia、Sylvain Marc
DOI:10.1021/jo060276a
日期:2006.4.1
The electron-rich cyclopentadienylruthenium complex CpRuCl(PPh3)2 turns out to be an efficient catalyst for the regio- and stereoselective cyclopropanation of bicyclic alkenes with tertiary propargylic carboxylates. The reaction provides 1,2,3-trisubstituted cyclopropanes in high yields as a single stereoisomer instead of the expected cyclobutenes via [2 + 2] cycloaddition. Functional groups such as
A CONVENIENT METHOD FOR BROMOSULFENYLATION: REACTIONS OF SULFENAMIDES WITH OLEFINS IN THE PRESENCE OF POBr<sub>3</sub>
作者:Nikolai V. Zyk、Elena K. Beloglazkina、Rimma Gazzaeva、Vladimir S. Tyurin、Igor D. Titanyuk
DOI:10.1080/10426509908044968
日期:1999.12
Abstract A general method for the one-pot transformation of alkenes into abromoalkyl-arylsulfdes has been proposed based on the sulfenylation reaction by means of sulfenamides in the presence of phosphorus oxibromide. The plausible reaction mechanism and the results of reactions with a number of model alkenes such as cyclohexene, I-heptene, norbornene and other from the bicyclo[2.2.1] heptane series
Cyclopentadienyl ruthenium(II) complexes with a large number of available coordination sites are frequently usedcatalysts for a broad range of transformations. To be able to render these transformations enantioselective, we have designed a chiral neutral CpxRu(II)Cl complex basing on an atropchiral cyclopentadienyl (Cpx) ligand which is accessed in a streamlined C–H functionalisation approach. The catalyst displays
具有大量可用配位位点的环戊二烯基钌 ( II ) 配合物是广泛转化中常用的催化剂。为了能够使这些转化具有对映选择性,我们设计了一种基于非手性环戊二烯基 (Cp x ) 配体的手性中性 Cp x Ru( II )Cl 配合物,该配体可通过简化的 C-H 官能化方法获得。该催化剂在对映选择性 [2+2]-环加成反应中表现出优异的反应活性和对映选择性,可生成应变手性环丁烯,从而使催化剂负载量低至 1 mol%。结合的氯阴离子的非常强的抗衡离子效应将相应的非选择性阳离子络合物转化为高度对映选择性的中性形式。此外,通过在反应结束时添加降冰片二烯,可以回收催化剂并随后重新使用。
Reactions of α-difluoro azides with olefins
作者:S. A. Lermontov、A. N. Pushin、S. V. Shkavrov、A. G. Polivanova
DOI:10.1007/s11172-010-0364-0
日期:2010.11
Reactions of α-difluoro azides with olefins result in oxidative fluoroamination or amination of the C=C bond.