Generation of sec-thioamide dianions and their regioselective reaction with electrophiles.
作者:Y. Tamaru、M. Kagotani、Y. Furukawa、Y. Amino、Z. Yoshida
DOI:10.1016/s0040-4039(01)81919-5
日期:1981.1
The enolates of sec-thioamides 8, which are generated by three different methods (scheme II and equation 1), are alkylated selectively at the α-carbon to the thiocarbonyl group. The unusual β′-lithiation to provide an intermediate 11 is observed for N-methyl-α, β-dimetylthioacrylamide and N-methyl-thiocyclohexenecarboxamide.
Reactions ofα,β-Unsaturated Thioamides with Diazo Compounds
作者:Daniel H. Egli、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.200690252
日期:2006.11
Several reactions of the α,β-unsaturatedthioamide 8 with diazo compounds 1a–1d were investigated. The reactions with CH2N2 (1a), diazocyclohexane (1b), and phenyldiazomethane (1c) proceeded via a 1,3-dipolar cycloaddition of the diazo dipole at the CC bond to give the corresponding 4,5-dihydro-1H-pyrazole-3-carbothioamides 12a–12c, i.e., the regioisomer which arose from the bond formation between