Abstract Ethynylation of 2,3:4,5-di- O -isopropylidene- aldehydo - L -arabinose (1) gave a high yield of the 3-epimeric heptyne derivatives 2 and 7 , separable by preparative g.l.c. or by fractional recrystallization of the derived 3,5-dinitrobenzoates 4 and 9 . Proof of configuration of 2 and 7 was effected by ozonolysis of the derived alkenes 6 and 11 to give derivatives of L -glucose and L -mannose
摘要2,3:4,5-二-O-异亚丙基-醛-
L-阿拉伯糖(1)的
乙炔化反应可得到高产率的3-表异构庚炔衍
生物2和7,可通过制备性glc或分步重结晶分离得到衍生3,5-
二硝基苯甲酸酯4和9。通过对衍生的烯烃6和11进行
臭氧分解,分别得到L-
葡萄糖和L-
甘露糖的衍
生物,来进行2和7构型的证明。通过将2和7转化为相应的五乙酰氧基庚炔18和13,然后进行
臭氧分解分别得到L-
葡萄糖酸和L-甘露酸的衍
生物,提供了第二个证明。两个系列的庚炔衍
生物的nmr光谱差异与C-3构型的差异相关。