An approach to pyrano[2,3-c]pyrazoles starting from spirocyclopropanepyrazoles via a ring-opening/cyanomethylation and intramolecular cyclization is described. Reactions of spirocyclopropanepyrazoles with chloroacetonitrile in the presence of sodium hydride gave the corresponding cyanomethoxypyrazoles . Treatment of with sodium hydride at room temperature caused intramolecular Michael addition reaction
描述了一种通过开环/氰基甲基化和分子内环化从螺环丙烷吡唑开始制备吡喃并[2,3- c ]吡唑的方法。螺环丙烷吡唑的反应 在氢化钠存在下用氯乙腈制得相应的氰基甲氧基吡唑类 。治疗与氢化钠在室温下引起分子内迈克尔加成反应,得到相应的吡喃并[2,3- c ]吡唑。J.杂环化学,(2009)。