Synthesis of a protonated C2-symmetric N,N-chiral “proton sponge”
摘要:
The hydrogen iodide salt of 1,8-bis-(N-benzyl-N-methylamino)naphthalene was synthesised as an 89/11 ratio of diastereomers in good yield. The structure of the major (+)-(RNRN/SNSN) diastereomer was determined by single crystal X-ray diffraction. The minor diastereomer is shown to be the meso-(RNSN) form by performing H-1 NMR n.O.e studies on isotopically desymmetrized 1-(N-benzyl-N-[C-13]-methylamino)-8-(N'-benzyl-N'-methylamino) naphthalene (HI salt). The half-life of interconversion of meso and dl forms is less than 2 minutes in CD2Cl2, at ambient temperature. (C) 1998 Elsevier Science Ltd. All rights reserved.
Borrowing Hydrogen-Mediated N-Alkylation Reactions by a Well-Defined Homogeneous Nickel Catalyst
作者:Amreen K. Bains、Abhishek Kundu、Sudha Yadav、Debashis Adhikari
DOI:10.1021/acscatal.9b02977
日期:2019.10.4
bench-stable azo-phenolate ligand-coordinated nickel catalyst which can efficiently execute N-alkylation of a variety of anilines by alcohol. We demonstrate that the redox-active azo ligand can store hydrogen generated during alcohol oxidation and redelivers the same to an in-situ-generated imine bond to result in N-alkylation of amines. The reaction has wide scope, and a large array of alcohols can directly
我们在这里报道了一种定义明确且稳定的偶氮酚盐配体配位的镍催化剂,该催化剂可以通过醇有效地进行多种苯胺的N-烷基化。我们证明,氧化还原活性偶氮配体可以存储在醇氧化过程中产生的氢,并将其重新转移到原位产生的亚胺键上,从而导致胺的N-烷基化。该反应的范围很广,并且大量的醇可以直接偶联到各种苯胺上。包括氘标记到基质上的机理研究建立了从醇中借用氢的方法,并指出了存在于配体主链上的氧化还原活性偶氮部分的关键作用。用自由基猝灭剂和更高的k H / k分离捕获形式的酮基中间体醇氧化步骤的D建议将氢原子转移(HAT)完全转移到还原的偶氮主链上,以铺平醇氧化,这与常规的金属-配体双功能机理相反。该实施例清楚地表明,廉价的贱金属催化剂可以在氧化还原活性配体主链的帮助下完成重要的偶联反应。
A general and expedient amination of alcohols catalysed by a single-site (NN)Co(<scp>ii</scp>)-bidentate complex under solventless conditions
Here we designed and synthesized a NN–CoII bidentate complex and efficiently used it for general and expedient amination of alcohols under benign, solventlessconditions. Both primary (including unactivated aliphatic) alcohols and sterically hindered secondary alcohols exhibited very good reactivity and provided diverse amines with good substrate scope (88 examples; up to 95% yields) and excellent
Synthesis of a protonated C2-symmetric N,N-chiral “proton sponge”
作者:Jonathan P.H. Charmant、Guy C. Lloyd-Jones、Torren M. Peakman、Robert L. Woodward
DOI:10.1016/s0040-4039(98)00930-7
日期:1998.6
The hydrogen iodide salt of 1,8-bis-(N-benzyl-N-methylamino)naphthalene was synthesised as an 89/11 ratio of diastereomers in good yield. The structure of the major (+)-(RNRN/SNSN) diastereomer was determined by single crystal X-ray diffraction. The minor diastereomer is shown to be the meso-(RNSN) form by performing H-1 NMR n.O.e studies on isotopically desymmetrized 1-(N-benzyl-N-[C-13]-methylamino)-8-(N'-benzyl-N'-methylamino) naphthalene (HI salt). The half-life of interconversion of meso and dl forms is less than 2 minutes in CD2Cl2, at ambient temperature. (C) 1998 Elsevier Science Ltd. All rights reserved.
Charmant, Jonathan P. H.; Lloyd-Jones, Guy C.; Peakman, Torren M., European Journal of Organic Chemistry, 1999, # 10, p. 2501 - 2510
作者:Charmant, Jonathan P. H.、Lloyd-Jones, Guy C.、Peakman, Torren M.、Woodward, Robert L.
DOI:——
日期:——
Konstantinchenko, A. A.; Pozharskii, A. A,; Stepanova, V. N., Russian Journal of Organic Chemistry, 1993, vol. 29, # 7.2, p. 1195 - 1199
作者:Konstantinchenko, A. A.、Pozharskii, A. A,、Stepanova, V. N.