Issue in Honor of Prof. S. Swaminathan ARKIVOC 2005 (xi) 89-101
MdamNH), 7.81 (d, 2 H, JNH-aH = 8.7 Hz, PheNH), 7.23-7.14 (m, 6 H, ArH), 6.65 (d, 2 H, JNH-aH = 9.2 Hz, ValNH), 5.17 (d, 2 H, J = 3.9 Hz, OH), 4.60 (ddd, 2 H, JNH-aH = 8.7, JaH-ß´H = 9.7, JaHß ´H = 4.3 Hz, PheCaH), 3.77-3.70 (m, 4 H, MdamC2H, C3H, C4H, C5H), 3.69 (dd, 2 H, JNH-aH = 9.2, JaH-ßH = 6.8 Hz, ValCaH), 3.27 (dt, 2 H, J = 6.3, 6.3 13.2 Hz, MdamC2H, C6H), 3.19 (dt, 2 H, J = 6.3, 6.3,13.2 Hz, MdamC1H´, C6H´), 2.97 (dd, 2 H, JaH-ß´H = 4.3, JßH-ß´H = 13.7 Hz, PheCß´H), 2.77 (dd, 2 H, JaH-ß´H = 9.7, JßH-ß´H = 13.7 Hz, PheCßH), 1.79(m, 2 H, ValCßH), 1.37 (s, 18 H, Boc), 0.69 (d, 6 H, JßH-.CH3 = 6.8 Hz, ValC.CH3), 0.64 (d, 2 H, JßH-.CH3 = 6.8 Hz, ValC.´CH3 ); 13C NMR (DMSO-d6, 125 MHz) d 171.10, 170.86, 155.27, 137.64, 129.18, 127.87, 126.11, 82.12, 78.18, 78.08, 60.10, 53.41, 41.10, 38.13, 30.41, 28.13, 19.04, 18.08; MS (LSIMS) m/z (%) 755 (22) [M + H – C5H8O2]+, 855 (15) [M + H]+, 877 (18) [M + Na]+.
Acknowledgements
We thank CSIR, New Delhi for research fellowships (MHVRR and SG) and DST, New Delhi for financial support.
References and Notes
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