Asymmetric Synthesis of α-Aryl Amino Acids; Aryne-Mediated Diastereoselective Arylation
摘要:
An aryne-mediated alpha-arylation reaction of Schollkopf's bis-lactim ether is described. Arynes were generated via an ortho-lithiation approach, affording syn-arylated products in up to 94:6 dr with moderate to good yields and excellent regioselectivities. Hydrolysis provided a variety of substituted arylglycines containing a range of functional groups without racemization.
Asymmetric Synthesis of α-Aryl Amino Acids; Aryne-Mediated Diastereoselective Arylation
摘要:
An aryne-mediated alpha-arylation reaction of Schollkopf's bis-lactim ether is described. Arynes were generated via an ortho-lithiation approach, affording syn-arylated products in up to 94:6 dr with moderate to good yields and excellent regioselectivities. Hydrolysis provided a variety of substituted arylglycines containing a range of functional groups without racemization.
Expedient Synthesis of <i>N</i>
-Methyl- and <i>N</i>
-Alkylamines by Reductive Amination using Reusable Cobalt Oxide Nanoparticles
作者:Thirusangumurugan Senthamarai、Kathiravan Murugesan、Kishore Natte、Narayana V. Kalevaru、Helfried Neumann、Paul C. J. Kamer、Rajenahally V. Jagadeesh
DOI:10.1002/cctc.201701617
日期:2018.3.21
the synthesis and functionalization of amines by using earth‐abundant metal‐based catalysts is of scientific interest. In this regard, herein we report an expedient reductive amination process for the selective synthesis of N‐methylated and N‐alkylated amines by using nitrogen‐doped, graphene‐activated nanoscale Co3O4‐based catalysts. Starting from inexpensive and easily accessible nitroarenes or amines
N-甲基和N-烷基胺代表重要的精细化学品和散装化学品,已广泛用于学术研究和工业生产中。值得注意的是,这些结构基序存在于大量生命科学分子中,并在调节其活动中起着至关重要的作用。因此,通过使用富含地球的金属基催化剂开发一种方便,经济高效的胺合成和官能化方法的研究具有科学意义。在这方面,我们在此报告了一种便捷的还原胺化工艺,该工艺通过使用氮掺杂的石墨烯活化的纳米级Co 3 O 4选择性合成N-甲基化和N-烷基化的胺。基于催化剂。从廉价且易于获得的硝基芳烃或胺和甲醛水溶液或存在甲酸的甲酸开始,这种经济高效的还原胺化方案可合成各种N-甲基和N-烷基胺,氨基酸衍生物和现有药物分子。
Asymmetric Synthesis of α-Aryl Amino Acids; Aryne-Mediated Diastereoselective Arylation
作者:Elizabeth P. Jones、Peter Jones、Anthony G. M. Barrett
DOI:10.1021/ol1030469
日期:2011.3.4
An aryne-mediated alpha-arylation reaction of Schollkopf's bis-lactim ether is described. Arynes were generated via an ortho-lithiation approach, affording syn-arylated products in up to 94:6 dr with moderate to good yields and excellent regioselectivities. Hydrolysis provided a variety of substituted arylglycines containing a range of functional groups without racemization.