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11 This compound gives satisfactory spectroscopic and analytical data.
13 Dihydroxylation of 12 gives a mixture of 13 and 13′ in a 10:1 ratio (Scheme
[3]
).
14 Colletodiol(1): mp 163-165 °C; R
f
= 0.35 [toluene-dioxane-AcOH, 20:10:1 (v/v/v)]; [α]D +35.6 (c 0.5, CHCl3). 1H NMR (300 MHz, CDCl3): δ = 6.73 (m, 2 H), 6.13 (d, J = 15.6 Hz, 1 H), 5.73 (d, J = 15.4 Hz, 1 H), 5.31 (m, 1 H), 5.18 (m, 1 H), 4.07 (dd, J = 8.5, 5.5 Hz, 1 H), 3.67 (dd, J = 8.0, 6.0 Hz, 1 H), 2.87 (br s, OH, 1 H), 2.72 (br s, OH, 1 H), 2.52 (m, 1 H), 2.22 (dt, J = 12.4, 11.4 Hz, 1 H), 2.01 (dd, J = 15.0, 3.5 Hz, 1 H), 1.50 (ddd, J = 15.8, 6.0, 2.0 Hz, 1 H), 1.36 (d, J = 6.5 Hz, 3 H), 1.34 (d, J = 6.8 Hz, 3 H). 13C NMR (75 MHz, CDCl3): δ = 166.6, 165.1, 146.3, 144.1, 125.7, 123.9, 74.0, 71.9, 68.7, 67.9, 41.1, 36.3, 20.4, 18.1. IR: 3600-3100 (br), 2980, 2934, 1748, 1716, 1653, 1444, 1347, 1314, 1261, 1172, 1105, 1034, 985, 916, 859, 824, 791, 742, 706, 631, 600 cm-1.
