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Paper | Regular issue | Vol 24, No. 11, 1986, pp.3169-3180
Published online, 1st January, 1970
DOI: 10.3987/R-1986-11-3169
Carbon-13 NMR Studies on Some Quinoxaline Amino Esters and Their N-Oxides

Salim S. Sabri,* Mustafa M. El-Abadelah, Hasan I. Tashtoush, and Helmut Duddeck

*Chemistry Department, Faculty of Science, University of Jordan, Amman 11942, Jordan

Abstract

Carbon-13 chemical shift assignments are reported for a series of N-(2-quinoxaloyl)-α-amino esters, their mono- and di-N-oxides as well as their C-3 methyl analogues. The influences of substituents at C-2 and/or C-3 on the N-oxidation shifts are discussed in terms of mesomeric states and intramolecular hydrogen bridging.