Cleavage of the methylenedioxy group with sodium methoxide in dimethyl sulfoxide.
作者:SHIGERU KOBAYASHI、MASARU KIHARA、YOSHINOBU YAMAHARA
DOI:10.1248/cpb.26.3113
日期:——
The methylenedioxy ring in piperonal (1) and its 6-substituted derivatives (5, 6, 9, and 10) was opened by heating with sodium methoxide in dimethyl sulfoxide to give the phenolic products, isovanillin (4) and its 6-substituted derivatives (7, 8, 11, and 12), respectively. Similarly, the nitro compounds (16 and 19) gave phenolic products (17 and 20, respectively) by this method. However, the ring in the compounds having methyl (compound 21), carboxyl (compound 22), methoxycarbonyl (compound 23), and amide (compound 24) groups instead of the formyl group in 1 could not be opened by this method.
在二甲基亚砜中,使用甲醇钠加热处理胡椒醛(1)及其6-取代衍生物(5、6、9和10),可分别得到酚类产物异香草醛(4)及其6-取代衍生物(7、8、11和12),这些产物是由甲二氧基环开环生成的。同样地,硝基化合物(16和19)通过这种方法也分别生成了酚类产物(17和20)。然而,对于那些以甲基(化合物21)、羧基(化合物22)、甲氧羰基(化合物23)和酰胺基(化合物24)替代了1中的醛基的化合物,这个方法无法打开它们的环。