Synthesis of some esters and lactones of aldonic acids
作者:W.J. Humphlett
DOI:10.1016/s0008-6215(00)82574-4
日期:1967.4
formation of esters of aldonic acids by treatment with an alcohol in the presence of an acid depends on the nature of the reagents and on the solubility of the products. The formation of aldonolactones is often a favored, competing reaction. Fully acetylated or benzoylated aldonic esters are formed without these restrictions. Among the products, liquid esters and certain of their acid chloride and
[GRAPHICS]The stereoselectivity of nucleophilic addition of 2-trimethylsilyloxyfuran to N-gulosyl-C-alkoxymethylnitrones was investigated. It was found that the selectivity was highly dependent on the bulkiness of the C-substituent of the nitrone. The major adducts were elaborated into the key intermediate of polyoxin C.
<i>exo</i>-Imino to <i>endo</i>-Iminocyclitol Rearrangement. A General Route to Five-Membered Antiviral Azasugars
作者:Robert M. Moriarty、Carmen I. Mitan、Norica Branzǎ-Nichita、Kenneth R. Phares、Damon Parrish
DOI:10.1021/ol061071r
日期:2006.8.1
A facile synthesis is reported for five-membered iminocyclitols which allows for variation in stereochemistry at all the chiral centers, diverse C-1- and N-substitution, and the potential for a three-component combinatorial process. The key step is inversion at the C-4 stereocenter (L-lyxo sugar -> D-ribono azasugar). The exo-imino to endo-iminocyclitol process was extended to the D-lyxo and the D- and L-hexose series. Some analogues were found to be more potent than N-butyl DNJ and N-nonyl DNJ in antiviral activity.