C-13 NMR AND 2D(H,H AND H,C COSY) SPECTRA OF TRIAZOLO-TRIAZINO-INDOLEDERIVATIVES AND THE CONFORMATIONAL-ANALYSIS OF THE RESPECTIVE C-NUCLEOSIDE ANALOGS

C-13 NMR and 2D (H,H and H,C COSY) spectra of selected examples of sug ar (5H-1,2,4-triazino[5,6-b]-indol-3-yl)hydrazones, peracetylated acet yl-1,2,4-triazino[5,6-b]indol-3-yl)hydrazones, and ,4-triazolo[4',3':2 ,3][1,2,4]triazino[5,6-b]indole have been reported. The conformation o f the latter C-nucleoside analogues have been determined by analysis o f their H-1 NMR spectra. The ($) double under bar D-galacto, ($) doubl e under bar D-manno and ($) double under bar L-arabino isomers are pre ponderantly existing in the planar zigzag arrangement of carbon atoms.