4,8,8-Tribromobicyclo[5.1.0]oct-4-en-3-ones from dibromocarbene adducts of cyclohexa-1,4-dienols
作者:A. K. Yagoub、George M. Iskander
DOI:10.1039/p19750001043
日期:——
Treatment of the bisdibromocarbene adducts (I) of substituted cyclohexa-1,4-dienols with pyridine or triethylamine gave α-bromo-αβ-unsaturated ketones (II) in good yields. The dihydroxy-diadduct (I; R1= H, R2= OH) gave the cyclo-octatrienone (IV), whereas the isomeric diadduct (I; R1= OH, R2= H) gave 3-bromo-4-hydroxybenzocyclobuten-1(2H)-one (VIII) in poor yield.
用吡啶或三乙胺处理取代的环己-1,4-二烯醇的双二溴卡宾加合物(I),可得到高产率的α-溴-αβ-不饱和酮(II)。二羟基二价产物(I; R 1 = H,R 2 = OH)给出了环八碳三烯酮(IV),而异构二元产物(I; R 1 = OH,R 2 = H)得到了3-溴-4-羟基苯并环丁烯-1(2 H)-一(VIII)收率不佳。