通常,可用于合成硫属元素金属的方法与苛刻条件,使用昂贵的金属,适用性广,纯化过程繁琐和收率低的缺点有关。为避免这些缺点,芳基取代的1,3-二烯基溴化物与硒氰酸钾/硫化钾(KSeCN / K 2S)导致了相应的硒代苯并噻吩的开发。碘相对较温和,价格便宜并且容易获得。通过该方法已经以高收率获得了几种不同取代的硒代苯并噻吩。使用该程序2-(4-氯苯基)噻吩,一种合成黑色素浓缩激素受体配体的关键中间体,参与了饮食失调,体重增加,肥胖,抑郁和焦虑症的治疗。尽管该反应基本上是一锅的,但它分两个步骤进行,涉及硒代氰酸酯/硫醇盐中间体,从而导致硒烯/噻吩。简单的操作,使用廉价的试剂和无金属的工艺使该程序对于容易获得取代的硒代苯并噻吩具有更大的吸引力。
通常,可用于合成硫属元素金属的方法与苛刻条件,使用昂贵的金属,适用性广,纯化过程繁琐和收率低的缺点有关。为避免这些缺点,芳基取代的1,3-二烯基溴化物与硒氰酸钾/硫化钾(KSeCN / K 2S)导致了相应的硒代苯并噻吩的开发。碘相对较温和,价格便宜并且容易获得。通过该方法已经以高收率获得了几种不同取代的硒代苯并噻吩。使用该程序2-(4-氯苯基)噻吩,一种合成黑色素浓缩激素受体配体的关键中间体,参与了饮食失调,体重增加,肥胖,抑郁和焦虑症的治疗。尽管该反应基本上是一锅的,但它分两个步骤进行,涉及硒代氰酸酯/硫醇盐中间体,从而导致硒烯/噻吩。简单的操作,使用廉价的试剂和无金属的工艺使该程序对于容易获得取代的硒代苯并噻吩具有更大的吸引力。
A preparation of bromoolefins from carbonyl compounds
作者:David R. Williams、K. Nishitani、W. Bennett、S.Y. Sit
DOI:10.1016/s0040-4039(01)82009-8
日期:1981.1
A variety of 1-bromoalkenes are prepared by addition of dibromomethyllithium to ketones and aldehydes followed by reductive elimination with zinc-aceticacid. The product E/Z ratios were determined, and halogen-lithium exchange with t-butyllithium was examined.
作者:Debasish Kundu、Manisha Tripathy、Pintu Maity、Brindaban C. Ranu
DOI:10.1002/chem.201500058
日期:2015.6.8
Cobalt(II)‐catalyzed C(sp2)O cross‐coupling between aryl/heteroaryl alcohols and vinyl/aryl halides in the presence of CuI has been achieved underligand‐free conditions. In this reaction, copper plays a significant role in transmetalation rather than being directly involved in the CO coupling. This unique Co/Cu‐dual catalyst system provides an easy access to a library of aryl–vinyl, heteroaryl–styryl
A co-operative Ni–Cu system for C<sub>sp</sub>–C<sub>sp</sub> and C<sub>sp</sub>–C<sub>sp2</sub> cross-coupling providing a direct access to unsymmetrical 1,3-diynes and en-ynes
作者:Nirmalya Mukherjee、Debasish Kundu、Brindaban C. Ranu
DOI:10.1039/c4cc07413k
日期:——
An efficient cross coupling of alkynes with alkynyl and alkenyl halides catalysed by a Ni–Cu system without any ligand leading to the synthesis of a series of functionalised 1,3-di-ynes and en-ynes has been achieved.
Nickel-Copper-Catalyzed C(<i>sp</i><sup>2</sup>)N Cross-Coupling of Cyclic and Bridged Amides: An Access to Cyclic Enamides and Alkenyl Vince Lactams
作者:Pintu Maity、Debasish Kundu、Brindaban C. Ranu
DOI:10.1002/adsc.201500457
日期:2015.11.16
of E2 type elimination of (Z)-styrenyl halides in the presence of a strong base like cesium carbonate followed by homocoupling. This catalystsystem works efficiently for the N-arylation too along with N-styrenylation and vinylation. The bridged as well as cyclic amides successfully coupled with substituted aryl halides to provide the corresponding products. In general, the reactions are clean and high
在没有任何配体的情况下,已开发出苯乙烯和卤化乙烯基与环和桥联酰胺的高效C(sp 2)N交叉偶联,乙酰丙酮丙酮化镍[Ni(acac)2 ]和碘化铜(I)催化。优化反应条件,以使碳酸铯(Cs 2 CO 3)(2.0当量)在N-甲基-2-吡咯烷酮(NMP)中,在氩气中,在Ni(acac)存在下,在110°C的条件下获得最大的产物收率。)2/ CuI(各10 mol%)。通过该程序获得了一系列文斯内酰胺(桥联酰胺)和环状酰胺的烯基衍生物。含卤素的苯乙烯基溴化物也要与酰胺偶合以提供产物。偶联具有高度的化学选择性,因为在反应过程中,芳环上的卤素(Br,Cl,F)保持完整,可用于进一步官能化以使这些酰胺更有用。尽管(E)-苯乙烯基卤化物产生了相应的(E)-苯乙烯基烯酰胺,但与(Z)-苯乙烯基卤化物的反应产生了1,3-二炔,而不是(Z)-苯乙烯基酰胺。可以通过消除E 2型消除(Z苯乙烯-卤化物在强碱(如碳
Copper-Assisted Nickel Catalyzed Ligand-Free C(sp<sup>2</sup>)–O Cross-Coupling of Vinyl Halides and Phenols
作者:Debasish Kundu、Pintu Maity、Brindaban C. Ranu
DOI:10.1021/ol500134p
日期:2014.2.21
A convenient and efficient protocol has been achieved for the cross-coupling of phenols and vinylhalides by a unique Ni/Cu catalytic system for the first time, where the reaction is catalyzed by Ni and Cu is involved in the transmetalation process. This procedure provides an easy access to a library of aryl-vinyl and aryl-styrenyl ethers.