3-乙氧基羰基-和3-乙酰基-2 H-环庚[ b ]呋喃-2-酮易于与丙二腈反应。氰基乙酰胺,氰基乙酸乙酯和丙二酸二乙酯,在乙醇钠或叔丁胺的存在下,分别得到相应的1,2,3-三取代的z并衍生物。这些a菁衍生物的结构是根据化学证据和光谱数据确定的。考虑到起始的2 H-环庚[ b ]呋喃-2-酮与所获得的氮杂环戊烯衍生物之间的结构相关性,提出了一种合理的反应过程,涉及七富烯型和二氢氮杂环戊烷型中间体,可用于从中形成氮杂环戊烯衍生物。 2 H-环庚基[ b]呋喃-2-酮。
CONDENSATION REACTION OF 2-METHYLAZULENE DERIVATIVES WITH BENZALDEHYDE; FORMATION OF 2-STYRYLAZULENES
作者:Motoyasu Saito、Tadayoshi Morita、Kahei Takase
DOI:10.1246/cl.1974.289
日期:1974.3.5
2-Methylazulene derivatives, possessing electron-withdrawing substituents, such as alkoxycarbonyl or cyano group, at the 1- and/or 3-positions, were reactive to undergo condensation reaction with benzaldehyde, in the presence of sodium alkoxide, yielding 2-styrylazulene derivatives, from which 2-styrylazulene itself could be derived by removal of the substituents.