Epoxidation studies of 2-styrylchromones using jacobsen's catalyst and hydrogen peroxide and iodosylbenzene as oxidants
作者:Clementina M. M. Santos、Artur M. S. Silva、José A. S. Cavaleiro、Tamás Patonay、Albert Lévai
DOI:10.1002/jhet.5570430526
日期:2006.9
The epoxidation of 2-styrylchromones 2a-h using Jacobsen's Mn(III)[salen] complex 1 as catalyst is reported for the first time. Several studies were performed using both hydrogen peroxide and iodosylbenzene as oxidants, in order to obtain the α,β-epoxy-2-styrylchromones 3a-h regioselectively. Due to the low reactivity of the substrates and the highly unstable character of the formed epoxides, reactions
首次报道了使用雅各布森的Mn(III)[salen]配合物1作为催化剂的2-苯乙烯基色酮2a-h的环氧化。使用过氧化氢和碘基苯作为氧化剂进行了数项研究,以选择性地获得α,β-环氧-2-苯乙烯基色酮3a-h。由于底物的低反应性和所形成的环氧化物的高度不稳定的特性,应在较低的转化率下中断反应以获得可接受的收率,尤其是在使用过氧化氢的情况下。