Hypervalent iodine oxidation of α-substituted 2,4-dihydroxyacetophenones: synthesis of novel <i>o</i>-iodophenoxy ethers via rearrangement of iodonium ylides
作者:Om Prakash、Vijay Sharma、Madan P Tanwar
DOI:10.1139/v99-097
日期:1999.7.1
at reflux temperature, to afford novel o-iodophenoxy ethers (4a-4i) via rearrangement of respective iodonium ylides (5a-5i). Key words: hypervalent iodine reagents, phenyliodonium diacetate, α-substituted 2,4-dihydroxyacetophenones, α-substituted 2-hydroxy-3-iodo-4-phenoxyacetophenones, iodonium ylides rearrangement
α-取代的 2,4-二羟基苯乙酮 (1a-1i) 在三种条件下被二乙酸苯基碘 (PIDA) 氧化 (i) PIDA-KOH-MeOH(碱性),0°C,(ii)PIDA-MeOH(中性)在回流温度下,和 (iii) PIDA-AcOH(酸性)在回流温度下,通过各自碘鎓叶立德(5a-5i)的重排得到新型邻碘苯氧基醚(4a-4i)。关键词: 高价碘试剂, 苯基碘鎓二乙酸盐, α-取代的2,4-二羟基苯乙酮, α-取代的2-羟基-3-碘-4-苯氧基苯乙酮, 碘鎓叶立德重排