Synthesen auf der Basis von 2-Oxoglutars�ure. II Zur Synthese von Heterocyclen durch Reaktionen von 3-Brom-2-oxoglutars�uredimethylester mit Binucleophilen
作者:H. Hartenstein、T. Blitzke、D. Sicker、H. Wilde
DOI:10.1002/prac.19933350210
日期:——
Reactions of dimethyl 3-bromo-2-oxoglutarate 2 with binucleophiles to form heterocycles proceed on two different pathways depending on the type of reactant. Thus, strong S-nucleophiles like thioureas and thiocarbohydrazide substitute initially the bromine atom and form 2-aminothiazoles 3-7 and the 1,3,4-thiadiazine 8. However, o-phenylendiamines reacted to form the brominated quinoxaline-2(1H)-one derivatives 9 and 10, resp.