5399-20-2Relevant articles and documents
Interrupting the Barton?McCombie reaction: Aqueous deoxygenative trifluoromethylation of o-alkyl thiocarbonates
Liu, Zhi-Yun,Cook, Silas P.
supporting information, p. 808 - 813 (2021/02/01)
The site-selective trifluoromethylation of aliphatic systems remains an important challenge. This work describes a light-driven, copper-mediated trifluoromethylation of O-alkyl thiocarbonates. The reaction provides broad functional group tolerance (e.g., alkyne, alkene, phenol, free alcohol, electron-rich and -deficient arenes), thereby offering orthogonality and practicality for trifluoromethylation. A radical organometallic mechanism is proposed.
Enzymatic transesterification of pharmacologically interesting β-aminocycloalkanol precursors
Gonzalez-Sabin, Javier,Rios-Lombardia, Nicolas,Gotor, Vicente,Moris, Francisco
, p. 1421 - 1425 (2013/12/04)
Chemoenzymatic syntheses of both enantiomers of cis- and trans-2-aminocyclopentanol as well as cis- and trans-2-aminocyclohexanol, which are valuable building blocks for a plethora of ligands and pharmaceuticals have been efficiently carried out. The strategy involves the stereospecific syntheses of racemic aminocycloalkanol precursors via tagging of a phthalimide as a masking group and subsequent lipase-catalyzed kinetic resolution. Most of the lipases exhibited excellent enantioselectivity (E a‰ 200) in the transesterification reactions of trans-derivatives, with both N-protected (R,R)-amino acetates and (S,S)-amino alcohols being isolated in enantiopure form. With regard to cis-derivatives, lipases were also very selective, even though the biotransformations were significantly slower.
Efficient preparation of biologically important 1,2-amino alcohols
Gupta, Pankaj,Rouf, Abdul,Shah, Bhahwal A.,Mukherjee, Debaraj,Taneja, Subhash C.
, p. 505 - 519 (2013/01/15)
An efficient three-step methodology developed for the preparation of 1,2-amino alcohols. In the first step a rapid coupling between bromoketones and potassium phthalimide in ionic liquid produced-phthalimido ketones in quantitative yields, which is followed by a facile reduction using NaCNBH 3 in acetic acid to give corresponding phthalimido alcohols and finally effecting hydrazinolysis in water at 60C to yield biologically important 1,2-amino alcohols.
Cyclic trans-β-amino alcohols: Preparation and enzymatic kinetic resolution
Rouf, Abdul,Gupta, Pankaj,Aga, Mushtaq A.,Kumar, Brijesh,Parshad, Rajinder,Taneja, Subhash C.
experimental part, p. 2134 - 2143 (2012/05/04)
Enantioenriched cyclic β-amino alcohols, trans-2-aminocyclohexanols (ee, >99%), trans-2-aminocyclopentanols (ee, >99%), trans-1-amino-2- indanols (ee, >99%) and trans-2-amino-1-indanols (ee, ~98%) were prepared in high yields via an Arthrobacter sp. Lipase/PLAP catalyzed kinetic resolution of racemic phthalimido acetates. The addition of toluene as a co-solvent dramatically improved the hydrolysis and enantioselectivity, whereas for indanols, substrate immobilization on Celite improved the efficacy of the kinetic resolution.