Stable Quinone Methides: Regioselectivepara-Oxidation of a 2,4-bis[(alkylthio)methyl]phenol and addition reactions to quinonemethides
作者:Hansrudolf Meier、Hanspeter Kuenzi、Hermann Fuhrer、G�nther Rist
DOI:10.1002/hlca.19940770308
日期:1994.5.11
The 2,4-bis-functionalized phenol 1 is dehydrogenated regioselectivity with potassium ferricyanide, affording the corresponding p-quinonemethide 2. Hydrolysis of 2 affords a mixture of dithioacetal 5a and benzaldehyde 6; 1,6-addition of thiols to 2 gives the dithioacetals 5 of benzaldehyde 6; reaction of 2 with 2,2′-azobis(isobutyronitrile) (= 2,2′-dimethyl-2,2′-azobis(propanenitrile)) leads to 9a
用铁氰化钾将2,4-双官能化的苯酚1脱氢区域选择性,得到相应的对苯二甲酮2。2的水解得到二硫缩醛5a和苯甲醛6的混合物。将1,6-硫醇加成2得到苯甲醛6的二硫缩醛5;的反应2用2,2'-偶氮二(异丁腈)(= 2,2'-二甲基2,2'-偶氮二(丙腈))导致9A,9B,和10中,1-氰基-1-的加成产物-甲基乙基。所有产品的结构主要通过以下方式确定1 H-和13 C-NMR光谱,并讨论了它们的形成方式。