A novel reactivity of α-nitro ketone tosylhydrazones with DBU. Synthesis of α,β-unsaturated enone tosylhydrazones
作者:Roberto Ballini、Gianni Giantomassi
DOI:10.1016/0040-4020(95)00133-s
日期:1995.4
Treatment of α-nitro ketone tosylhydrazones with DBU gives 1,4-elimination of nitrous acid affording 1-tosylazoalkenes which, under basic conditions (DBU), tautomerize to the more stable enone tosylhydrazones. The obtained tosylhydrazones may be used as starting material for a wide range of other functionalities. Removal of the hydrazone affords conjugated enones in good yields. Due to the possibility
用DBU处理α-硝基酮甲苯磺酰基hydr,得到亚硝酸的1,4-消除,得到1-甲苯磺酰基烯基,其在碱性条件(DBU)下互变异构为更稳定的烯酮甲苯磺酰基hydr。所获得的甲苯磺酰hydr可以用作多种其他功能的起始原料。除去the可得到高收率的共轭烯酮。由于可以制备在α或α'位置具有硝基的硝基酮,因此通过这种方法可以获得具有完全区域选择性的α,β-不饱和羰基化合物。