| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| —— | Methyl-3-amino-3-desoxy-4-C-methyl-β-D-xylopyranosid | 75292-03-4 | C7H15NO4 | 177.2 |
The exocyclic olefin, 5, obtained from the known epoxy uloside, methyl 2,3-anhydro-β-D-erythro-pentopyranosid-4-ulose, 3, reacts with ammonia or methylamine to give the 3-amino-3-deoxy or 3-methylamino-3-deoxy derivatives respectively. The benzamide, 8c, obtained from the former, reacts with iodonium ion to give an oxazoline in which the cis relationship between the tertiary alcohol and the 3-amino group of garosamine is secured. Deiodination is followed by a one-pot N-methylation and reduction. A hydrolysis gives methyl α-L-garosamimide 2. In a second route, the urethane, 16c, reacts with iodonium ion to give an oxazolidone 17a. This reaction establishes the N-hydroxyamino moiety and circumvents the N-methylation/reduction steps. Deiodination followed by deprotection yields methyl α-L-garosaminide 2. Both routes require eight steps from 3 with overall yields of 14% and 11%, respectively.