中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | N-(2-bromophenyl)-N-methylpropiolamide | 267408-61-7 | C10H8BrNO | 238.084 |
—— | N-(2'-Bromophenyl)-N-prop-2-enylpropynamide | 267408-63-9 | C12H10BrNO | 264.121 |
—— | N-(2'-Bromophenyl)-N-methyl-3-tert-butyldimethylsilylpropynamide | 267408-64-0 | C16H22BrNOSi | 352.346 |
—— | N-(2-bromophenyl)-N-methyl-3-phenylpropiolamide | 1013905-86-6 | C16H12BrNO | 314.181 |
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.