Catalytic Asymmetric Mannich Reaction of α-Fluoronitriles with Ketimines: Enantioselective and Diastereodivergent Construction of Vicinal Tetrasubstituted Stereocenters
作者:Ransheng Ding、Zeus A. De los Santos、Christian Wolf
DOI:10.1021/acscatal.8b05164
日期:2019.3.1
Diastereodivergent and enantioselective conversion of isatin ketimines to α-fluoro-β-aminonitriles with vicinaltetrasubstituted stereocenters is achieved by a chiral copper complex/guanidine base catalyzed Mannich reaction with proper choice of the bisphosphine ligand. The reaction is broad in scope, scalable, and provides efficient access to a series of 3-aminoindolinones exhibiting a quaternary
A novel synthesis of α-fluoroacetonitriles. Application to a convenient preparation of 2-fluoro-2-phenethylamines
作者:Michael E. LeTourneau、James R. McCarthy
DOI:10.1016/s0040-4039(01)81570-7
日期:——
α-Fluorophenylacetonitriles (3) are readily prepared by the treatment of the corresponding benzaldehyde cyanohydrin trimethylsilylethers (2) with diethylaminosulfur trifluoride (DAST). This method for the introduction of fluorine alpha to a cyano group is also applicable to the cyanohydrin trimethylsilylethers of aromatic ketones. Diborane reduction of the α-fluorophenylacetonitriles (3) yields 2-
Preparation of Benzylic α,α-Difluoronitriles, -tetrazoles, and -sulfonates via Electrophilic Fluorination
作者:Christopher C. Kotoris、Mei-Jin Chen、Scott D. Taylor
DOI:10.1021/jo981163x
日期:1998.10.1
LETOURNEAU, M. E.;MCCARTHY, J. R., TETRAHEDRON LETT., 1984, 25, N 46, 5227-5230
作者:LETOURNEAU, M. E.、MCCARTHY, J. R.
DOI:——
日期:——
Enantioseparation and racemization of α‐aryl‐α‐fluoroacetonitriles
作者:Sarah E. Steber、Angelette N. D. L. Pham、Eryn Nelson、Christian Wolf
DOI:10.1002/chir.23367
日期:2021.12
2-Aryl-2-fluoroacetonitriles have garnered increasing interest as versatilebuildingblocks in asymmetric synthesis. However, the configurational stability of these organofluorines is poorly understood and analytical methods that can be used to differentiate between their enantiomers remain underdeveloped. In this study, baseline high performance liquid chromatography (HPLC) enantioseparation of ten