Mannich reactions of π-excessive heterocycles using bis-(dialkylamino)methanes and alkoxydialkylaminomethanes activated with acetyl chloride or sulphur dioxide
作者:Stephen C Eyley、Harry Heaney、George Papageorgiou、Robert F Wilkins
DOI:10.1016/0040-4039(88)85070-6
日期:1988.1
Π-Excessive heterocycles react rapidly with bis(dialkylamino)methanes (aminals) and alkoxydialkylaminomethanes (aminol ethers) in acetonitrile to afford Mannich bases in good yields when activated by means of an acidic reagent such as acetylchloride or sulphur dioxide: the principal compound studied was -methylpyrrole.
Mannich reactions of nucleophilic aromatic compounds involving aminals and α-amino ethers activated by chlorosilane derivatives; catalysis by chlorotrimethylsilane
作者:Harry Heaney、George Papageorgiou、Robert F. Wilkins
DOI:10.1039/c39880001161
日期:——
with dichloro(dimethyl)- and trichloro(methyl)-silanes, but whereas chlorotrimethylsilane interacts with α-amino ethers to yield iminium salts, the reaction of the latter silane with aminals does not: in situ Mannich reactions may be carried out using these systems, and in the case of the reactions using chlorotrimethylsilane and aminals the reactions can be catalytic with respect to the silane.
The effect of sulphur dioxide on the mannich reactions of phenols
作者:Robin A. Fairhurst、Harry Heaney、George Papageorgiou、Robert F. Wilkins
DOI:10.1016/s0040-4039(00)82196-6
日期:1988.1
Regioselectivity in the -dialkylaminomethylation of phenols is greatest, for example in reactions of 2,5-dimethylphenol, when a mixture of the phenol and sulphurdioxide is allowed to stand for several hours before the addition of a bis-(dialkylamino)methane (aminal) or an alkoxydialkylaminomethane (aminol ether).
Compounds having a selective N-type calcium channel antagonistic activity are provided. Dihydropyridine derivatives represented by the following formula:
1
analogs thereof and pharmaceutically acceptable salts thereof have an activity of selectively inhibiting the action of N-type calcium channel, and they are used as therapeutic agents for various diseases relating to N-type calcium channel.
Method for producing high-purity quaternary ammonium salt
申请人:Nishida Tetsuo
公开号:US20100044617A1
公开(公告)日:2010-02-25
A process for preparing a high-purity quaternary ammonium salt comprising:
(1) adding an oxide or hydroxide of a Group 1, 2, 12 or 13 metal to a quaternary ammonium salt containing a protonic acid salt of a tertiary amine as an impurity and thereby neutralizing the tertiary amine protonic acid salt with the metal oxide or hydroxide to convert the acid salt to a tertiary amine and water and to convert the metal oxide or hydroxide to a metal salt at the same time, and
(2) removing the tertiary amine, water and metal salt produced from the system.