Dimerization of N-(pyrid-2-YL)- and N-(5-methylpyrid-2-YL) cyanoacetamides by the action of butylthiodibutylborane
摘要:
The reaction of N-(pyrid-2-yl) and N-(5-methylpyrid-2-yl) cyanoacetamides with butylthiodibutylborane in a 2:3 ratio leads to the formation of trinuclear complex boron compounds, the alcoholysis of which gave N,N'-di(pyrid-2-yl) 3-amino-2-cyanopent-2-ene-1,5-diamides. The latter are dimers of the starting cyanamides, which are capable of acting as hexadentate chelating agents.
It was found that the reaction of thioboronites with carbonyl compounds and ketene proceeds with the initial formation of vinyloxyboranes (VII). The boranes were found to be important intermediates for the formation of β-hydroxythiolesters by the reaction with various carbonyl compounds. Vinyloxyborane derivatives can be alternatively prepared by the reactions of trialkylboranes and α-diazocarbonyl
Synthesis and X-ray study of a bis-diphenylboron chelate of 3-(diaminomethylene)pentane-2,4-dione
作者:V. A. Dorokhoy、L. G. Vorontsova、M. G. Kurella、L. I. Parfenova
DOI:10.1007/bf01431123
日期:1996.11
A bis-diphenylboron chelate has been synthesized from 3-(diaminomethylene)pentane-2,4-dione through the action of (butylthio)diphenylborane and its molecular and crystal structures have been determined. The two boron -containing rings have the same six-membered skeleton but differ substantially in conformation and geometric parameters.
n-Butyl di-n-butylthioboronite reacts with isocyanates to give 1:2 adducts, and with isothiocyanate or carbodiimide to give a 1:1 adduct. It was found that thioboronite forms a 1:1 co-ordinated complex with benzyl cyanide, and that the complex reacts with isocyanates to give the corresponding acetamidine derivatives in good yields.