Aerobic oxidative coupling of alcohols and amines towards imine formation by a dicopper(I,I) catalyst
作者:Indranil Dutta、Subhabrata De、Sudhir Yadav、Ranajit Mondol、Jitendra K. Bera
DOI:10.1016/j.jorganchem.2017.05.009
日期:2017.11
A dicopper(I,I) complex [Cu2(L1) (Cl)2] (1), bearing a Cu2Cl2 core spanned by a naphthyridine–diimine ligand is synthesized by the treatment of CuCl with 2,7–bis(N–mesitylmethylimino)–1,8–naphthyridine (L1). The catalytic efficacy of 1 is assessed for aerobic oxidative synthesis of imines from alcohols and amines. The title complex is found to be an excellent catalyst for a wide variety of alcohols
Osmium Hydride Acetylacetonate Complexes and Their Application in Acceptorless Dehydrogenative Coupling of Alcohols and Amines and for the Dehydrogenation of Cyclic Amines
作者:Miguel A. Esteruelas、Virginia Lezáun、Antonio Martínez、Montserrat Oliván、Enrique Oñate
DOI:10.1021/acs.organomet.7b00521
日期:2017.8.14
presence of 5 mol % of KOH, complexes 3–6 promote the coupling of benzylalcohol and aniline to give N-benzylideneaniline and H2. Under the same conditions, complex 3 catalyzes a wide range of analogous couplings to afford a variety of imines, including aliphatic imines, with yields between 90 and 40% after 1–48 h. Complex 3 also catalyzes the dehydrogenation of cyclic amines. According to the amount
从OsH 6(P i Pr 3)2(1)和OsH 2 Cl 2(P i Pr 3)2(2)开始制备新的氢化配合物,以及它们在醇和胺的无受体脱氢偶联中的催化活性并报道了环胺的脱氢。配合物1与乙酰丙酮(Hacac)反应,得到经典的三氢化物OsH 3(acac)(P i Pr 3)2(3)。3的质子化用三氟甲磺酸(HOTf)产生H 2的释放并形成不饱和二氢os(IV)[OsH 2(acac)(P i Pr 3)2 ] OTf(4),也可以从2开始通过中间体OsH 2 Cl(acac)(P i Pr 3)2(5)。用KOH处理5的乙酰丙酮溶液,得到Os(acac)2(P i Pr 3)2(6)。在5摩尔%的KOH存在下,络合物3– 6促进苄醇和苯胺的偶联,得到N-苄叉基苯胺和H 2。在相同条件下,配合物3催化多种类似的偶合反应,从而提供各种亚胺,包括脂肪族亚胺,在1–48小时后收率在90%至40%
Iron-Catalyzed Mild and Selective Hydrogenative Cross-Coupling of Nitriles and Amines To Form Secondary Aldimines
The first example of a base‐metal‐catalyzed homogeneous hydrogenative coupling of nitriles and amines to selectively form secondary cross‐imines is reported. The reaction is catalyzed under mild conditions by a well‐defined (iPr‐PNP)Fe(H)Br(CO) pincer pre‐catalyst and catalytic tBuOK.
Direct Access to POP-Type Osmium(II) and Osmium(IV) Complexes: Osmium a Promising Alternative to Ruthenium for the Synthesis of Imines from Alcohols and Amines
作者:Miguel A. Esteruelas、Nicole Honczek、Montserrat Oliván、Enrique Oñate、Marta Valencia
DOI:10.1021/om200290u
日期:2011.5.9
easy and direct access to POP-type osmium(II) and osmium(IV) complexes, including OsH4dbf(PiPr2)2} (dbf(PiPr2)2 = 4,6-bis(diisopropylphosphine)dibenzofuran), is reported. This tetrahydride derivative is an efficient catalyst for the selective formation of imines fromalcohols and amines with liberation of H2, proving that osmium is a promising alternative to ruthenium for catalysis.
轻松直接访问POP型(II)和(IV)络合物,包括OsH 4 dbf(P i Pr 2)2 }(dbf(P i Pr 2)2 = 4,6-双(二异丙基膦) )二苯并呋喃)。该四氢化物衍生物是从醇和胺中选择性释放出H 2选择性地形成亚胺的有效催化剂,证明是钌的理想替代催化剂。
Synthesis of the Aspidosperma Alkaloid Na-Formyl-16-α-Hydroxyaspidospermidine
作者:Fatiha Belferdi、Abdelhamid Belattar
DOI:10.3390/61000803
日期:——
The first total synthesis of Na-formyl-16α-hydroxyaspidospermidine and its isomer via (°)-vincadifformine is described and their structure elucidation using different methods of analysis is reported.