中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 1-methyl-3-(pentafluoroethyl)-1H-pyrazole-5-carboxylic acid methyl ester | —— | C8H7F5N2O2 | 258.148 |
—— | methyl 4-amino-1-methyl-3-(pentafluoroethyl)-1H-pyrazole-5-carboxylate | —— | C8H8F5N3O2 | 273.162 |
—— | methyl 1-methyl-4-(methylsulphanyl)-3-(pentafluoroethyl)-1H-pyrazole-5-carboxylate | —— | C9H9F5N2O2S | 304.241 |
—— | 1-methyl-3-(pentafluoroethyl)-1H-pyrazole | 1226890-62-5 | C6H5F5N2 | 200.111 |
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.