An efficient and improved synthesis of 1,5-diketones: versatile conjugate addition of nucleophiles to α,β-unsaturated enones and alkynones
作者:Ravi Shankar、Ashok K. Jha、Uma Sharan Singh、K. Hajela
DOI:10.1016/j.tetlet.2006.03.008
日期:2006.5
Several 1,5-diketones have been prepared in good to excellent yields by versatile conjugate addition of nucleophiles such as cyclic or acyclic ketones, amines and thiols to α,β-unsaturated enones and alkynones, in the presence of catalytic amounts of 10% aq NaOH, TBAI and DMSO at ambient temperature. The choice of solvent and phase-transfer catalyst played a critical role in improving the reaction
在催化量为10%的aq的情况下,通过将多种亲核试剂(例如环状或无环酮,胺和硫醇)广泛共轭加成到α,β-不饱和烯酮和炔酮上,已经制备了几种1,5-二酮,收率良好。 NaOH,TBAI和DMSO在环境温度下。溶剂和相转移催化剂的选择在提高产物的反应速率和产率中起关键作用。