Nucleophilic Substitution of Aliphatic Fluorides via Pseudohalide Intermediates
作者:Amit K. Jaiswal、Pragati K. Prasad、Rowan D. Young
DOI:10.1002/chem.201806272
日期:2019.5.2
silylated pseudohalides TMS‐OMs or TMS‐NTf2, resulting in the formation of TMS‐F and a trapped aliphatic pseudohalide intermediate. The rate of fluoride/pseudohalide exchange and the stability of this intermediate are such that little rearrangement is observed for terminal fluoride positions in linear aliphatic fluorides. The ability to convert organofluoride positions into pseudohalide groups allows
efficient one-pot synthesis of sterically hindered aromatic tertiary amines through Lewis acid induced intermolecular Schmidt reaction of benzylic azides is described. In the presence of EtAlCl2, benzylic azide underwent a smooth Schmidt reaction to give the corresponding iminium ion, which, upon reduction with NaBH4 in situ, afforded the tertiary amine. The effects of substituents on the aromatic ring and
The present invention relates to methods of treating neurodegenerative diseases with the neuroprotective agents of Formulas I-IV and XII and the other compounds described herein. The neuroprotective agents inhibit nitric oxide synthase enzymes and in particular nitric oxide synthase III (NOS III) and can be used to treat Alzheimer's disease.