Syntheses of methylenedioxydiphenides and dimethoxydiphenides.
作者:SHIGERU KOBAYASHI、SATOSHI MINEO、MASARU KIHARA、SUSUMU TAGASHIRA
DOI:10.1248/cpb.24.2191
日期:——
Methylenedioxydiphenides (IIa and IIIa) and dimethoxydiphenides (IIb, c and IIIb, c) were prepared from unsymmetrical diphenaldehydes (IVa-c) by intramolecular Cannizzaro reactions and then lactonization of the resulting alcoholic acids (Va-c and VIa-c). The structures of IIa-c and IIIa-c were confirmed by comparison of physical and spectral data of these compounds with those of authentic samples prepared by unambiguous methods. The directions of the two kinds of intramolecular Cannizzaro reactions of IV to form V and VI are discussed.
通过分子内坎尼扎罗反应,然后对生成的醇酸(Va-c 和 VIa-c)进行内酯化反应,从非对称二苯二甲醛(IVa-c)制备出亚甲基二氧基二苯并呋喃(IIa 和 IIIa)和二甲氧基二苯并呋喃(IIb, c 和 IIIb, c)。通过将 IIa-c 和 IIIa-c 的物理和光谱数据与用明确方法制备的真实样品进行比较,确认了这些化合物的结构。讨论了 IV 形成 V 和 VI 的两种分子内 Cannizzaro 反应的方向。