1. Methods for pyranoannulation: an approach to a new class of polyethers
2. 30. The condensation of glucose and β-diketones
3. 4: mp 107.5–108.5°C (lit.2 mp 102°C); [α]D23 -118° [lit.2 [α]D20 -104°(c 0.4, CH3OH] (c 0.9.CH3OH); 1H NMR (CDCl3) δ 6.60 (s, 1H), 4.64–4.66 (d, 1 H, J = 6.4 Hz), 4.36–4.40, (m, 2H), 4.22–4.27 (dd, 1H, J = 10 and 4.7 Hz), 3.87–3.91 (dd, 1 H, J = 10 and 2.3 Hz), 3.35 (br s, 1 H, OH), 3.50 (br s 1 H, OH) 2.57 (s, 3H), 2.38 (s, 3H); exact mass calcd for C11H14O5 226.0841, found 226.0832. 2: mp 151–151.5°C (lit.2 mp 152°C; [α]D23 -16° (c 1.9, H2O) [lit.2 [α]D-18° (c 5.0, H2O)].
4. Lonomycins B and C. Two new components of polyether antibiotics fermentation, isolation and characterization.