The present invention relates to a compound of formula I
wherein R
1
, R
2
, and Ar are as defined herein or to a pharmaceutically acceptable acid addition salt, to a racemic mixture, or to its corresponding enantiomer and/or optical isomer thereof. These compounds and their pharmaceutical compositions are useful in the treatment of neurological and neuropsychiatric disorders.
The Michaelreaction of various nitroalkanes 1 with electrophilic alkenes 2 can be performed in NaOH (0.025−0.1 M), without any organic solvent. In many cases the presence of cetyltrimethylammonium chloride (CTACl), as cationic surfactant, produces better results. Good yields of the products 3 are obtained even with hindered, and functionalized starting materials.
Synthesis of β-Functionalized α,β-Unsaturated Oximes via Silylation of Nitro Compounds
作者:Vitaly M. Danilenko、Alexander A. Tishkov、Sema L. Ioffe、Ilya M. Lyapkalo、Yury A. Strelenko、Vladimir A. Tartakovsky
DOI:10.1055/s-2002-23539
日期:——
A general method for the synthesis of conjugated enoximes 2 via silylation of functionalized aliphatic nitrocompounds 1 has been claborated. The configuration of obtained products has been determined by NMR spectroscopy.
The nitro group in tertiary or secondary aliphatic nitro compounds is replaced by hydrogen or deuterium on treatment with tributyltin hydride or tributyltin deuteride, respectively.
Tertiary, benzyl, and allylic nitro compounds undergo nuclephilic substitutionreactions with carbonnucleophiles such as electron rich aromatic compounds, allylsilanes, or silyl enol ethers in the presence of SnCl4.