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

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Intens.<br />

6<br />

x10<br />

911.5<br />

2<br />

1<br />

0<br />

500 1000 1500 2000 2500 m/z<br />

Figure 36. ESI-MS spectrum for macrocycle (14) from DMF and ACN.<br />

Intens.<br />

5<br />

x10<br />

1.00<br />

0.75<br />

738.3<br />

753.3<br />

796.4<br />

881.5<br />

912.5<br />

0.50<br />

0.25<br />

0.00<br />

271.9<br />

286.0<br />

300.0<br />

314.0<br />

341.1<br />

398.1 428.1456.1<br />

369.1<br />

497.1<br />

569.1<br />

300 400 500 600 700 800<br />

m/z<br />

723.3<br />

782.4<br />

836.4<br />

863.4<br />

Figure 37. Tandem ESI-MS 2 spectrum for macrocycle (14) from DMF and ACN.<br />

Scheme 7. Proposed fragmentation mechanism for macrocycle (14).<br />

S22

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