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9 We thank Prof. Travis Dudding (Brock University) for performing transition state optimization calculations (Gaussian 03) for the C
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10 We thank one of the referees for suggesting this explanation.
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14 Compound 18: colorless oil; [α]D
23 -48.5 (c 0.275, CHCl3). IR (film): ν = 3448, 3340, 2956, 2926, 2871, 1631, 1548, 1496, 1446, 1372, 1322, 1173, 1097, 986, 954, 917, 863, 815, 759, 700, 661, 609, 541 cm-1. 1H NMR (499 MHz, CDCl3): δ = 7.28-7.46 (m, 5 H), 7.06 (br s, 1 H), 5.76 (br s, 1 H), 5.06 (dt, J = 9.3, 2.2 Hz, 1 H), 4.80 (td, J = 11.0, 4.6 Hz, 1 H), 4.24 (ddd, J = 10.6, 8.8, 2.8 Hz, 1 H), 4.13 (ddd, J = 18.2, 10.3, 9.2 Hz, 1 H), 2.68 (br s, 1 H), 2.08 (d, J = 12.5 Hz, 1 H), 1.83-1.91 (m, 1 H), 1.67 (d, J = 12.1 Hz, 2 H), 1.32-1.51 (m, 2 H), 0.99 (q, J = 11.6 Hz, 1 H), 0.91 (d, J = 5.8 Hz, 3 H), 0.89 (dd, J = 6.8, 1.0 Hz, 3 H), 0.85 (m, 1 H), 0.76 (t, J = 6.5 Hz, 3 H). 13C NMR (126 MHz, CDCl3): δ = 160.3, 138.5, 129.1, 128.7, 126.5, 79.5, 75.0, 72.1, 47.1, 40.7, 34.1, 31.5, 26.4, 23.3, 22.4, 21.2, 16.8. HRMS: m/z calcd for C19H30N2O5S: 398.1875; found: 398.1855.
15 We thank Dr. Ion Ghiviriga (NMR) and Dr. David Powell (mass spectrometry) from the University of Florida for their assistance with the structure assignment of 18. The details of these assignments will be reported in an upcoming full paper.