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The Development of Novel Antibiotics Using ... - Jacobs University

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Intens.<br />

[%<br />

100 ]<br />

836.2764<br />

904.3379<br />

80<br />

60<br />

40<br />

783.2115<br />

851.2741<br />

911.3229<br />

926.3164 979.3822<br />

20<br />

799.1904<br />

868.2782<br />

0<br />

780 800 820 840 860 880 900 920 940 960 m/z<br />

Figure 7. ESI-TOF mass spectrum for refluxing compounds 1-4, spectrum recorded after 2 h in the<br />

positive ion mode, products were detected as [M+H] + and [M+Na] + ions.<br />

Intens.<br />

O<br />

O<br />

399.1304<br />

600<br />

N<br />

HN<br />

400<br />

O<br />

O<br />

O<br />

O<br />

HN NH2<br />

13<br />

200<br />

396.4222<br />

398.1400<br />

0<br />

395.5 396.0 396.5 397.0 397.5 398.0 398.5 399.0 m/z<br />

Intens.<br />

474.1769<br />

3000<br />

O<br />

HN<br />

N<br />

N<br />

2000<br />

O O<br />

O<br />

HN<br />

NH 2<br />

14<br />

O<br />

1000<br />

0<br />

475.1749<br />

476.1896<br />

467.1815<br />

464.1839<br />

468.1740 473.1864<br />

470.1925<br />

464 466 468 470 472 474 476 m/z<br />

7 | S

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