Cyanoacetyldiazoindol-2-one (3), the condensation product of cyanoacetohydrazide with isatin (1), could be cyclized in acidic medium via its CN group and its enolic OH to give cyanomethyloxadiazole-spiroindoline (4). The presence of the methylcyano side chain could be invested—through oximation, diazotization, or condensation with aldehydes—to form polyfunctional spiroindolines 5, 8–10. Also, a second
Cyanoacetyldiazoindol-2-one (3) 是
氰基乙酰
肼与
靛红 (1) 的缩合产物,可在酸性介质中通过其 CN 基团和烯醇 OH 环化得到
氰甲基恶二唑-螺二氢
吲哚 (4)。甲基
氰基侧链的存在可以通过
肟化、重氮化或与醛缩合来形成多功能螺二氢
吲哚 5, 8-10。此外,可以通过对
靛红衍
生物中的 3 位进行亲核攻击,然后闭环得到 6 和 7 来实现制备标题化合物的第二种途径。 © 2002 Wiley Periodicals, Inc. Heteroatom Chem 13:207–210 , 2002; 在线发表于 Wiley Interscience (www.interscience.wiley.com)。DOI 10.1002/hc.10020