Lanthanide(III) trifluoromethanesulfonates (triflates), such as Yb(OTf)3, Nd(OTf)3 and Gd(OTf)3, catalyze in a extraordinarily efficient way the aminolysis of 1,2-epoxides, affording the corresponding β-amino alcohols, at room temperature and in a non-protic solvent (CH2Cl2 or toluene), in very good yields. The reactions are completely anti stereoselective and highly regioselective.
CONTINUOUS FLOW SYNTHESIS OF AMINO ALCOHOLS USING MICROREACTORS
申请人:Bedore Matthew W.
公开号:US20110118469A1
公开(公告)日:2011-05-19
The present invention provides various methods for the synthesis of chemical species in a microreactor environment. In some cases, reaction products of the present invention may be valuable as intermediates and/or products in pharmaceutical and polymer research. For example, the method may involve the synthesis of amino alcohols within a microchannel. Embodiment described herein may allow for reactions with significantly shorter reaction times and increased efficiency.
Solvent-Directed Epoxide Opening with Primary Amines for the Synthesis of β-Amino Alcohols
作者:Gustavo Moura-Letts、Joseph Lizza
DOI:10.1055/s-0036-1588356
日期:——
efficient synthesis of β-amino alcohols from a variety of epoxides and primary unbranched amines in the absence of any catalyst in high yields and regioselectivities is reported. A variety of polar mixed solvent systems allow for the selective formation of secondary amino alcohols over tertiary amino alcohols. The reaction scope extends to a wide variety of aromatic and aliphatic substituted epoxides and
Microwave-assisted Aminolysis of Epoxides Under Solvent-free Conditions Catalyzed by Montmorillonite Clay
作者:Mohammad M. Mojtahedi、Mohammad R. Saidi、Mohammad Bolourtchian
DOI:10.1039/a804379e
日期:——
The reaction of primary and secondary amines with epoxides in the presence of montmorillonite K10 clay, under solvent-free condtions and microwave irradiation affords high yields of β-amino alcohols.
A New and Efficient Epoxide Ring Opening via Poor Nucleophiles: Indole, <i>p</i>-Nitroaniline, Borane and <i>O</i>-Trimethylsilylhydroxylamine in Lithium Perchlorate
2-epoxyphenylether and allyl(2-epoxymethyl) ether are observed through reactions with poor nucleophiles such as indole, borane, O-trimethylsilylhydroxylamine, p-nitroaniline and sterically hindered tert-butylamine in the presence of 5.0 Mlithium perchlorate-Et 2 O solution. These reactions are fast, convenient, with rather high yields and are carried out at ambienttemperatures.
2,3-二甲基环氧乙烷、2-环氧苯基醚和烯丙基(2-环氧甲基)醚通过与吲哚、硼烷、O-三甲基甲硅烷基羟胺、对硝基苯胺和空间位阻叔丁胺等不良亲核试剂的反应观察到高区域选择性开环。存在 5.0 M 高氯酸锂-Et 2 O 溶液。这些反应快速、方便、产率相当高,并且在环境温度下进行。