Nickel(II) Chloride-Catalyzed Regioselective Hydrothiolation of Alkynes
作者:Valentine P. Ananikov、Denis A. Malyshev、Irina P. Beletskaya、Grigory G. Aleksandrov、Igor L. Eremenko
DOI:10.1002/adsc.200505168
日期:2005.12
of PhSH to alkynes (HC≡C-R) has been performed using easily available nickel complexes. The non-catalytic side reaction leading to anti-Markovnikov products was suppressed by addition of γ-terpinene to the catalytic system. The other side reaction leading to the bis(phenylthio)alkene was avoided by excluding phosphine and phosphite ligands from the catalytic system. It was found that catalytic amounts
使用容易获得的镍络合物,将PhSH的区域选择性Markovnikov型加成到炔烃(HC≡CR)中。通过向催化体系中添加γ-萜品烯抑制了导致抗马尔科夫尼科夫产物的非催化副反应。通过从催化体系中排除膦和亚磷酸酯配体,避免了导致双(苯硫基)烯烃的另一副反应。发现催化量的Et 3 N显着提高了催化反应的产率和选择性。在最佳条件下,各种炔烃[R = n -C 5 H 11,CH 2 NMe 2,CH 2 OMe,CH2 SPh,C 6 H 11(OH),(CH 2)3 CN]。报告了一种合成产物的X射线结构。
Palladium - catalyzed reactions of trialkylstannyl phenyl sulfides with alkenyl bromides. A new diastereoselective synthesis of (E)-1-alkenyl phenyl sulfides
作者:Adriano Carpita、Renzo Rossi、Barbara Scamuzzi
DOI:10.1016/s0040-4039(00)99102-0
日期:1989.1
The reaction of easily available stereoisomeric mixtures of 1-alkenyl bromides with molar excesses of trialkylstannyl phenylsulfides takes place readily in the presence of Pd(PPH3)4 to afford diastereoselectively (E)-1-alkenyl phenylsulfides in excellent yields.
A facile synthetic protocol, which utilized dehydrative condensation of phthalic anhydride and primary amines, for symmetrical non-chelating poly-N-heterocyclic carbene ligands was established. With the designed bi-functional building block, poly-NHC ligands having various denticities and geometries could be readily achieved by varying the structure of poly-amino compounds. Examination of catalytic activity of a series of poly-NHC–Ni complexes revealed the lack of electronic interference among NHC–metal units.
A simple and general preparation of vinylic sulfides, selenides and tellurides
作者:Claudio C. Silveira、Paulo Cesar S. Santos、Samuel R. Mendes、Antonio L. Braga
DOI:10.1016/j.jorganchem.2008.09.039
日期:2008.12
A general method for the synthesis of vinylic chalcogenides by nucleophilic and Ni-catalyzed vinylic substitution on vinylichalides by phenyl chalcogenolates is described. The reactions were regio and stereoselective for the nickel catalyzed substitution, and mixture of isomers was observed for some examples in the thermal process in DMF.