Overcoming inaccessibility of fluorinated imines – synthesis of functionalized amines from readily available fluoroacetamides
作者:Paweł J. Czerwiński、Bartłomiej Furman
DOI:10.1039/c9cc04111g
日期:——
Although imines are convenient substrates for the synthesis of functionalized amines, they may be hard to obtain, as in the case of fluorinatedimines. To aid in overcoming this issue, we propose a protocol of corresponding amine synthesis from simple fluoroacetic acid-derived amides using Schwartz's reagent.
Alcohols as Fluoroalkyl Synthons: Ni‐catalyzed Dehydrogenative Approach to Access Polyfluoroalkyl Bis‐indoles
作者:V. Arun、Lisa Roy、Suman De Sarkar
DOI:10.1002/chem.202003912
日期:2020.12.15
An acceptorless dehydrogenative strategy for the synthesis of polyfluoroalkylated bis‐indoles is described by employing an earth‐abundant nickel‐based catalytic system under air. The notable feature of the present transformation is the use of bench stable and easily affordable polyfluorinated alcohols without any pre‐functionalization for the introduction of precious polyfluoroalkyl groups. The developed
Tertiary Amides as Fluoroalkyl Aldehyde Surrogates: Access to <i>meso</i>-Fluorinated Bis(heteroaryl)methanes
作者:Paweł J. Czerwiński、Barbara Grzeszczyk、Bartłomiej Furman
DOI:10.1021/acs.orglett.2c03839
日期:2022.12.23
fluoroalkyl aldehydes. This discovery is applied to the one-pot synthesis of a symmetrical and, more challengingly, unsymmetrical meso-fluoroalkylated bis(heteroaryl)methanes via a Schwartz’s reagent-mediated reductive activation. The usefulness of this approach for the introduction of a fluoromethylated carbon bridge was proven by implementation of the developed methodology in the synthesis of a fluorine-decorated
Convenient preparation of 1-(indol-3-yl)-2,2,2-trifluoroethylamines via Friedel–Crafts reaction of α-trifluoroacetaldehyde hemiaminal
作者:Yuefa Gong、Katsuya Kato
DOI:10.1016/s0022-1139(00)00407-3
日期:2001.3
Electrophilic substitution of indole with trifluoroacetaldehyde hemiaminals 1a-f, prepared from primary amines and trifluoroacetaldehyde ethyl hemiacetal (TFAE), proceeds readily in the presence of Lewis acids. Formation of N-alkyl 1-(indol-3-yl)-2,2,2-trifluoroethylamines (2) is preferred in the presence of BF3, but yield of 2,2,2-trifluoroethyl alcohol (3) markedly increases when ZnI2 is used. A stereochemistry study clearly showed that ethylamines 2e and 2f are produced with high diastereoselective excess when the optically active hemiaminals 1e and 1f are used. (C) 2001 Elsevier Science B.V. All rights reserved.