作者:Daniel H. Egli、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.200690252
日期:2006.11
Several reactions of the α,β-unsaturated thioamide 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
研究了α,β-不饱和硫酰胺8与重氮化合物1a - 1d的几种反应。用CH反应2 Ñ 2(1A),diazocyclohexane(1B),和phenyldiazomethane(1C)进行经由在CC键重氮偶极子的1,3-偶极环加成,得到相应的4,5-二氢-1- ħ -pyrazole-3-carbothioamides 12a – 12c,即由重氮化合物N末端与C(α)8的原子。在1a与8的反应中,在短的反应时间之后获得了最初形成的环加合物,即4,5-二氢-3 H-吡唑-3-碳硫代酰胺11a。在1c的情况下,形成两个互变异构体12c和12c ',其通过用2-氯苯甲酰氯14衍生化而得到结晶产物15和15 '。通过X射线晶体学确定它们的结构。根据8与重氮乙酸乙酯(1d)的反应,对位的区域异构体13成立了。单取代的硫代酰胺16与1a反应,得到不稳定的4,5-二氢-1 H-吡唑-3-碳硫代酰胺17。