Pyrimidine, Pyrazine, Quinoxaline, Quinazoline, and Related Alkaloids

10 Pyrimidine, Pyrazine, Quinoxaline, Quinazoline, and Related Alkaloids 

1 Prenylated Quinazoline Alkaloids from a Marine-Derived Fungus Aspergillus carneus 

Two quinazoline alkaloids were also isolated and characterized in the study reported by AfiyatuUov and coworkers (see also Section 7.3.3) [54]. For the first, 92 (R = -H), correlations were observed from 14-methine and 18-vinyl protons to the N2 resonating at 128.5 ppm, while the H7 resonance correlated to the N5 quinazoline nitrogen. In the case of the second homolog, 93 R = -OH, only a correlation from the hydroxyl group to the quinazoline N5 resonance at 208.3 ppm was reported by the authors. 

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