A one-pot reaction between C2F5CH2NH2·HCl, NaNO2 and electron-deficient alkynes gives C2F5-substituted pyrazoles in excellent yields. The transformation smoothly proceeds in dichloromethane/water, tolerates the presence of air, and requires no purification of products by column chromatography. Mechanistically, C2F5CH2NH2·HCl and NaNO2 react first in water to generate C2F5CHN2, that participates in a [3 + 2] cycloaddition with electron-deficient alkynes in dichloromethane.
一种涉及C
2F
5CH
2NH
2·HCl、NaNO
2和缺电子
炔烃的一锅反应,以优异的产率得到C
2F
5-取代的
吡唑。该转化在
二氯甲烷/
水体系中顺利进行,耐受空气存在,且无需通过柱色谱法纯化产物。机理上,C
2F
5CH
2NH
2·HCl和NaNO
2首先在
水相中反应生成C
2F
5CHN
2,然后与
二氯甲烷中的缺电子
炔烃进行[3 + 2]环加成反应。