A convenient one-pot synthesis of new 3-(4-aryl-5-oxo-5,6,7,8-tetrahydro-<i>4H</i>-chromen-2-yl)-<i>2H</i>-chromen-2-ones
作者:V. Rajeswar Rao、V. Ravinder Reddy
DOI:10.1002/jhet.5570440331
日期:2007.5
8-tetrahydro-4H-chromen-2yl)-2H-chromen-2-ones (3a, 3c) and 5,6-benzoanalogs of 3-(4-aryl-5-oxo-5,6,7,8-tetrahydro-4H-chromen-2yl)-2H-chromen-2-one (5a,5b). Under similar conditions arylidine-3-acetylcoumarins (1a, 1b,1d, 1e, 1f) and 5,6-benzoanalog of arylidine 3-acetyl coumarin (4b) react with 5,5-dimethyl-1,3-cyclohexanedione (dimedone) yielding 3-(4-aryl-7,7-dimethyl-5-oxo-5,6,7,8-tetrahydro-4H-chromen-2-yl)-2H-chromen-2-ones
芳基-3-乙酰基香豆素(1a-c)和芳基3-乙酰基香豆素(4a,4b)的5,6-苯并类似物与1,3-环己二酮的无水溴化锌催化反应得到-(4-芳基-5-氧代-5,6,7,8-四氢-4- ħ -色烯-2-基)-2- ħ -色烯-2-酮(3A,3C)和3-(4-芳基-5-氧代- 5,6- benzoanalogs 5,6,7,8-四氢-4 H-铬-2-基)-2 H-铬-2-一(5a,5b)。在类似条件下,芳基3-乙酰基香豆素(4b)和芳基3-乙酰基香豆素(1a,1b,1d,1e,1f)和5,6-苯并类似物)与5,5-二甲基-1,3-环己二酮(二甲酮)反应,生成3-(4-芳基-7,7-二甲基-5-氧代-5,6,7,8-四氢-4 H-铬烯- 2-yl)-2 H -chromen-2-ones(3d-3h)和3.(4-芳基-7,7-二甲基-5-氧代-5,6,7,8 -四氢-4 H-铬-2-基)-2 H-铬-2-一(5c)。