• Bulletin of the Korean Chemical Society
• /
• v.8 no.6
• /
• pp.466-470
• /
• 1987

Di-2-pyridyl thionocarbonate, prepared from thiophosgene and 2-hydroxypyridine in the presence of triethylamine in dichloromethane, was found to be very effective for dehydration, dehydrosulfurization, and thiocarbonyl transfer reactions. Di-2-pyridyl thionocarbonate was successfully for the esterification of carboxylic acids, dehydration of aldoximes into nitriles, preparation of isothiocyanates from amines, and preparation of cyclic thionocarbonates from 1,2- and 1,3-diols.

• Archives of Pharmacal Research
• /
• v.14 no.4
• /
• pp.319-324
• /
• 1991

2,6-Dimethyl-4-(3'-nitrophenyl)-3-methoxylaminocarbonyl-1,4-dihydropyridine-5-carboxylic acid methylester, 3b reacted with 2-cyanoethanol or benzylalcohol to give the corresponding cyanoethylurethane compound 6c in 40.6% yield and benzylurethane compound 6d in 32% yield. The cyanoethylurethane 6c was hydrolized in ethanolic NaOH to give 2,6-dimethyl-4-(3'-nitrophenyl)-1,4-dihydropyridine-3-amino-5-carboxylic acid 5-methyl ester. HCl 8 in 64.8% yield. Another acid hydrolysis of benzylurethane 6d gave 2,6-dimethyl-4-(3'-nitrophenyl)-1,4-dihydropyridine-3-amino-5-carboxylic acid 5-methylester. HBr 11 in 54.7% yield.

• Bulletin of the Korean Chemical Society
• /
• v.25 no.5
• /
• pp.676-680
• /
• 2004

Complexes M($C_7H_2NO_5)3H_2O{\cdot}H_2O{\cdot}0.25MeCN$ (M=Ni, Co) were crystallized from the reactions of $Ni(CH_3COO)_2{\cdot}4H_2O\;or\;Co(CH_3COO)_2{\cdot}2H_2O$ with KSCN and 2,6-dicarboxy-4-hydroxypyridine (chelidamic acid). The structures were characterized by X-ray crystallography. The crystal structures of 1 and 2 show a distorted octahedral coordination geometry around the M(II) ions, which are chelated by one nitrogen atom and two oxygen atoms of the chelidamic acid and three water molecules. Complexes 1 and 2 display the hydrogen-bonded 3D framework. The magnetic behavior of 2 exhibits antiferromagnetic interaction.