Hydrolysis of acyl derivatives of malonaldehyde dianil. I.
作者:SHINZO TAMURA、MACHIKO ONO
DOI:10.1248/cpb.29.308
日期:——
The hydrolysis of acyl derivatives of malonaldehyde dianil was examined. Alkaline hydrolysis of 1-(N-acetyl-p-methylphenylamino)-3-(p-methylphenylimino)-1-propene (V) in aqueous ethanol gave simply 1-(p-methylphenylamino)-3-(p-methylphenylimino)-1-propene (malonaldehyde dianil of p-toluidine) (VI) and acetic acid. Hydrolysis of 1-(N-benzoyl-p-methylphenylamino)-3-(p-methylphenylimino)-1-propene (VII) in aqueous dioxane in the presence of equimolar amounts of acetic acid and sodium acetate gave β-(p-toluidino) acrolein (VIII), β-(N-benzoyl-p-toluidino) acrolein (XIII) and N-benzoyl-p-toluidine. A small amount of β-(p-toluidino) crotonaldehyde (II) was obtained by hydrolysis of 1-(N-benzoyl-p-methylphenylamino)-3-(p-methylphenylimino)-1-butene (IX). The buffer-catalyzed hydrolysis reaction of VII was followed by measuring the PMR spectrum of the reaction solution to elucidate the sequence of the reaction process.
Selective solvent-free oxidation of alcohols with potassium dichromate
作者:Ji-Dong Lou、Zhi-Nan Xu
DOI:10.1016/s0040-4039(02)02234-7
日期:2002.12
Selective oxidation of primary alcohols to the corresponding aldehydes by potassiumdichromate at room temperature under solvent-free conditions are described. This new procedure can also oxidise secondary alcohols.
Efficient Oxidation of Alcohols with Potassium Permanganate Adsorbed on Aluminum Silicate Reagent
作者:Lan-Zhou Wang、Ji-Dong Lou、Li-Yun Zhu
DOI:10.1007/s00706-003-0098-x
日期:2004.1.1
A new reagent, potassium permanganate adsorbed on aluminum silicate, suitable for the oxidation of primary and secondary alcohols to the corresponding carbonyl compounds is described.
Solvent free oxidation of alcohols with manganese dioxide
作者:Ji-Dong Lou、Zhi-Nan Xu
DOI:10.1016/s0040-4039(02)01345-x
日期:2002.8
The oxidation of primary and secondary alcohols to the corresponding aldehydes and ketones by manganesedioxide under solvent free conditions are described. This new oxidation procedure is very simple and affords good yields.
Constituents of Tropical Medicinal Plants, LXIII: Synthesis of 2-Methoxyonychine Alkaloids - Structure Revision of Oxylopidine
作者:Hans Achenbach、Andreas Schwinn
DOI:10.1002/ardp.19943271202
日期:——
were cyclized by polyphosphoric acid to yield the corresponding 2‐methoxyonychines. By this method a number of 2‐methoxy‐substituted onychines were prepared for the first time, i.a. oxylopidine, the structure of which has to be revised.