中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | methyl-3,6-anhydro-α-D-glucopyranoside | 13407-60-8 | C7H12O5 | 176.169 |
alpha-甲基葡萄糖甙 | methyl-alpha-D-glucopyranoside | 97-30-3 | C7H14O6 | 194.185 |
—— | methyl 2,3,4-tri-O-acetyl-α-D-glucopyranose | 7432-72-6 | C13H20O9 | 320.296 |
甲基 6-氯-6-脱氧-alpha-D-吡喃葡萄糖苷 | methyl 6-chloro-6-deoxy-α-D-glucopyranoside | 4144-87-0 | C7H13ClO5 | 212.63 |
Hydrolysis of methyl 6-chloro-6-deoxy-2,3,4-tri-O-methyl-α-D-glucopyranoside (19b) and Swern oxidation of the resulting anomeric hemiacetals (20) gave 6-chloro-6-deoxy-2,3,4-tri-O-methyl-D-glucono-1,5-lactone (21), treatment of which with 1,2-bis( trimethylsilyloxy )ethane in the presence of trimethylsilyl trifluoromethanesulfonate gave 6-chloro-1,6-dideoxy-1,1-ethylenedioxy-2,3,4-tri-O-methyl-D-glucopyranose (23a). Conversion of (23a) into the corresponding 6-iodo compound (23b) and treatment of this with 1,8-diazabicyclo[5.4.0]undec-7-ene afforded the enolic ortho ester 1,6-dideoxy-1,1-ethylenedioxy-2,3,4-tri-O-methyl-D-xylo-hex-5-enopyranose (26). Reaction of (26) with methylmagnesium iodide, or with titanium tetrachloride, gave (1R,6S,7R,8R,9S)-7,8,9-trimethoxy-6-methyl-2,5-dioxabicyclo[4.3.1]decan-1-ol (34), or (2S,3R,4R)-5,5-ethylenedioxy-2,3,4-trimethoxycyclohexanone (28), respectively.