tris(pentafluorophenyl)borane, B(C6F5)3, and BF3·Et2O are shown to catalyze the regioselective hydrothiolation of a wide range of terminal 1-aryl-1,3-dienes. In the case of internal 1,3-dienes, B(C6F5)3 is by far the better catalyst than BF3·Et2O. The process features mild reaction conditions, broad scope, and low catalyst loading, and it can be scaled up quickly over a short reaction time. The reactions are rate-limited
报道了用于合成仲和叔烯丙基硫醚的无过渡金属的1,3-二烯氢硫醇化反应。硼路易斯酸三(五氟苯基)硼烷,B(C 6 F 5)3和BF 3 ·Et 2 O已显示出催化范围广泛的末端1-芳基-1,3-二烯的区域选择性氢硫醇化反应。在内部1,3-二烯的情况下,与BF 3 ·Et 2相比,B(C 6 F 5)3是更好的催化剂。O.该工艺的特点是反应条件温和,适用范围广,催化剂用量低,并且可以在较短的反应时间内迅速扩大规模。如高水平DFT计算所示,反应是通过1,3-二烯与硫醇-硼路易斯酸配合物的1-芳基定向质子化,然后将硫化物阴离子转移到所得的烯丙基阳离子上来进行的,从而限制了反应的速率。
Ni‐Catalyzed Regioselective Hydroarylation of 1‐Aryl‐1,3‐Butadienes with Aryl Halides
An efficient nickel-catalyzed regioselective hydroarylation of 1,3-dienes with arylhalides and using silanes as hydride source is developed, affording functionalized arenes in good to excellent yields under mild conditions. The protocol shows a high tolerance to various functional groups on both the dienes and aryl coupling partners. Mechanism studies indicate that π-allyl nickel species is likely
Photoinduced Palladium-Catalyzed Carbofunctionalization of Conjugated Dienes Proceeding via Radical-Polar Crossover Scenario: 1,2-Aminoalkylation and Beyond
作者:Kelvin Pak Shing Cheung、Daria Kurandina、Tetsuji Yata、Vladimir Gevorgyan
DOI:10.1021/jacs.0c03993
日期:2020.6.3
A photoinduced palladium-catalyzed 1,2-carbofunctionalization of conjugateddienes has been developed. This mild modular approach, which does not require employment of exogeneous photosensitizers and external oxidants, allows for efficient and highly regio- and ste-reoselective synthesis of a broad range of allylic amines from readily available 1,3-dienes, alkyl iodides, and amines. Employment of O-
Synthesis of ferrocenes with ene-terminus via water-promoted Barbier-like carbonyl allylation using bimetallic copper(II)/tin(II) reagent
作者:Paromita Debroy、Sujit Roy
DOI:10.1016/s0022-328x(03)00205-5
日期:2003.5
Fc[CH2C(R2)CH(R1)CH-μ(O)-CHCH(R1)C(R2)CH2] (8–11). The latter appear to result from the dehydration of intermediate homoallylic alcohols. Dehydration could be arrested in case of reaction of 1 and 2 with 1-bromo-3-methyl-but-2-ene, which results in the formation of homoallylic alcohols FcCH(OH)C(Me2)CHCH2 (7) and Fc[CH(OH)C(Me2)CHCH2]2 (12), respectively. All the reactions completely fail in absence of water.
Synthesis, structure, electrochemistry and ROMP-activity of new ferrocenyl analog of Grubbs’ metathesis catalyst
作者:Tarun K. Maishal、Biplab Mondal、Vedavati G. Puranik、Prakash P. Wadgaonkar、Goutam Kumar Lahiri、Amitabha Sarkar
DOI:10.1016/j.jorganchem.2004.11.012
日期:2005.2
complexes have been solved. The crystal structure of II confirmed the assigned structure and revealed existence of two sets of intermolecular C–H–Cl(M) type interactions, viz. (Ru)Cl–H–C(ferrocene) and (Ru)Cl–H–CHCl2. The air-stable, dark solid II is an efficient catalyst for ring-opening metathesis polymerization (ROMP) of cyclopentene, norbornene and cycloocta-1,5-diene. Electrochemical behavior of
的[(PCY治疗3)2氯2 RUCH-PH(我用乙烯基二茂铁)1和1二茂铁基-1,3-丁二烯2得到的固体产物。这些新配合物进行了表征1 H NMR,31 P NMR和13 C NMR光谱。两种配合物的X射线晶体结构均已解决。的晶体结构II证明给定的结构,并显示两组间C-H-CL(M)型的相互作用,即是否存在。(Ru)的CL-H-C(二茂铁)和(Ru)的CL-H-三氯甲烷2。空气稳定,深色固体II为环戊烯,降冰片烯和环辛-1,5-二烯的开环易位聚合(ROMP)的有效催化剂。该复合物的电化学行为清楚地反映了两个金属中心之间的电子通信。