中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 4-O-(3,4-Di-O-acetyl-2,6-dideoxy-α-D-arabino-hexopyranosyl)-2,6-dideoxy-D-arabino-hexopyranose | 90762-97-3 | C16H26O9 | 362.377 |
—— | 4-O-(3,4-Di-O-acetyl-2,6-dideoxy-α-D-arabino-hexopyranosyl)-2,6-dideoxy-D-arabino-hexopyranose | 90762-98-4 | C16H26O9 | 362.377 |
—— | 4-O-(3,4-Di-O-acetyl-2,6-dideoxy-β-D-arabino-hexopyranosyl)-2,6-dideoxy-α-D-arabino-hexopyranose | 90763-09-0 | C16H26O9 | 362.377 |
—— | 4-O-(3,4-Di-O-acetyl-2,6-dideoxy-β-D-arabino-hexopyranosyl)-2,6-dideoxy-α-D-arabino-hexopyranose | 90762-97-3 | C16H26O9 | 362.377 |
—— | Bamflalactone Triacetate | 90763-07-8 | C18H26O10 | 402.398 |
—— | (4R,5S,6R)-5-[(2R,4R,5S,6R)-4,5-dihydroxy-6-methyloxan-2-yl]oxy-6-methyloxane-2,4-diol | 90762-99-5 | C12H22O7 | 278.302 |
—— | Benzyl 4-O-(3,4-Di-O-acetyl-2,6-dideoxy-α-D-arabino-hexopyranosyl)-3-O-benzyl-2,6-dideoxy-α-D-arabino-hexopyranoside | 90762-96-2 | C30H38O9 | 542.626 |
—— | (2R,3R,4R,6S)-3,4,6-Tris-benzyloxy-2-methyl-tetrahydro-pyran | 90762-89-3 | C27H30O4 | 418.533 |
—— | Benzyl 4-O-Benzyl-2,6-dideoxy-α-D-arabino-hexopyranoside | 75124-38-8 | C20H24O4 | 328.408 |
—— | Acetic acid (2R,3R,4R,6R)-3-acetoxy-6-iodo-2-methyl-tetrahydro-pyran-4-yl ester | 634584-50-2 | C10H15IO5 | 342.131 |
—— | Benzyl 3-O-Benzyl-2,6-dideoxy-α-D-arabino-hexopyranoside | 90762-88-2 | C20H24O4 | 328.408 |
—— | Benzyl 2,6-Dideoxy-α-D-arabino-hexopyranoside | 75810-07-0 | C13H18O4 | 238.284 |
3-Deoxy-6′-hydroxy-13-norurdamycinone B (32a) and 3-deoxy-13-norurdamycinone B (32b) have been synthesized in eight steps from 5,8-dimethoxynaphthalen-1-ol (9) both in 28% overall yield. The key step in this approach is the boron trifluoride diethyl etherate promoted β-C-glycosylations of (9) and 1,3,4,6-tetra-O-acetyl-2-deoxy- and 1,3,4-tri-O-acetyl-2-deoxy-D-arabino-hexopyranoses (13) and (19). The solvent, acetonitrile, was essential for the success of these reactions. Acetylation of the C-glycosyl-5,8-dimethoxynaphthalen-1-ols (16) and (20) followed by oxidation with ceric ammonium nitrate gave C-glycosyl-5-acetoxy-1,4-naphthoquinone derivatives (21) and (23) in 63 and 49% overall yields from (9). Selective deacetylation of the C 5 acetoxy groups of (21) and (23) was achieved by treatment with boron trifluoride etherate in dichloromethane to give 3,4,6-tri-O-acetyl- 2-deoxy- and 3,4-di-O-acetyl-2,6-dideoxy-β-D-arabino-hexopyranosyl-5-hydroxy-1,4-naphthoquinones (24) and (25) respectively. The tetra-O-acetyl diborate promoted Diels–Alder reactions of (24) and (25) with (±)-(E)-1-acetoxy-3-(2-methoxyvinyl)cyclohex-2-ene (8) each gave a 1 : 1 mixture of diastereoisomeric cycloadducts which, upon treatment with 1,8-diazabicyclo[5.4.0]undec-7-ene gave (1R*)-1-acetoxy-9-(3,4,6-tri-O-acetyl-2-deoxy-β-D-arabino-hexopyranosyl)- and (1R*)-1-acetoxy-9-(3,4-di-O-acetyl-2,6-dideoxy-β-D-arabino-hexopyranosyl)-8-hydroxy-1,2,3,4-tetrahydrobenz[a]anthracene-7,12-dione (30a) and (30b) respectively. Sequential deacetylation and photochemical oxidation of (30a) and (30b) gave the targets (32a) and (32b) respectively.