The author of 《Polyfunctional Bis-Lewis-Acid-/Bis-Triazolium Catalysts for Stereoselective 1,4-Additions of 2-Oxindoles to Maleimides》 were Schmid, Juliane; Junge, Thorsten; Lang, Johannes; Frey, Wolfgang; Peters, Rene. And the article was published in Angewandte Chemie, International Edition in 2019. Reference of (1S,2R)-1-Amino-2,3-dihydro-1H-inden-2-ol The author mentioned the following in the article:
A novel type of polyfunctional catalyst, which contains Lewis acidic cobalt centers and triazolium moieties was developed. This catalyst type enabled highly enantio- and diastereoselective synthesis of substituted indoles I [R1 = H, Boc; R2 = Me, CH2C6H11, Bn, etc.; R3 = H, 5-Me, 5-Br, etc.] via direct 1,4-additions of 3-substituted oxindoles to maleimides with generation of two adjacent stereocenters. After use, the catalyst could be readily recycled by precipitation and used again with similar efficiency. Based on kinetic studies, a cooperative mode of action was very likely. Control experiments revealed the necessity of the triazolium rings for high stereoselectivity, which was explained by hydrogen-bond activation. The experimental part of the paper was very detailed, including the reaction process of (1S,2R)-1-Amino-2,3-dihydro-1H-inden-2-ol(cas: 126456-43-7Reference of (1S,2R)-1-Amino-2,3-dihydro-1H-inden-2-ol)
(1S,2R)-1-Amino-2,3-dihydro-1H-inden-2-ol(cas: 126456-43-7) belongs to anime. Aniline, ethanolamines, and several other amines are major industrial commodities used in making rubber, dyes, pharmaceuticals, and synthetic resins and fibres and for a host of other applications. Most of the numerous methods for the preparation of amines may be broadly divided into two groups: (1) chemical reduction (replacement of oxygen with hydrogen atoms in the molecule) of members of several other classes of organic nitrogen compounds and (2) reactions of ammonia or amines with organic compounds.Reference of (1S,2R)-1-Amino-2,3-dihydro-1H-inden-2-ol
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