Example 6
White solid, 5.2 g, two-step yield is 70.3%. 1H NMR (400 MHz, CD3OD) δ 5.08 (t, J=6.8 Hz, 1H, H-24), 4.39 (d, J=6.2 Hz, 1H, H-1′), 3.82 (s, 1H), 3.71 (dd, J=10.6, 6.6 Hz, 1H), 3.64 (dd, J=10.8, 6.4 Hz, 1H), 3.46-3.42 (m, 3H), 3.35 (d, J=9.4 Hz, 1H), 3.14 (dd, J=10.7, 4.5 Hz, 1H), 2.52-2.40 (m, 2H), 2.11 (dd, J=12.7, 2.3 Hz, 1H), 1.66 (s, 4H), 1.62 (s, 3H), 1.27 (s, 3H), 1.11 (s, 3H), 0.98 (s, 3H), 0.97 (s, 3H), 0.80 (s, 3H), 0.74 (s, 3H); 13C NMR (150 MHz, CD3OD) δ 215.6, 131.9, 126.0, 98.8, 82.4, 79.3, 76.1, 75.6, 73.1, 70.1, 62.1, 57.5, 57.2, 57.1, 56.4, 43.0, 41.9, 40.7, 40.6, 40.0, 39.9, 38.8, 35.6, 33.0, 28.6, 27.9, 25.9, 24.9, 24.7, 22.9, 19.5, 17.8, 17.1, 16.7, 16.3, 16.0.
MALDI-HRMS calcd for C36H60NaO8 [M+Na]+643.4180, found 643.4190.
