A facile route to phenyl, phenylsulfanyl and phenylselanyl substituted pyrano[3,2-c]chromenes
作者:Margita Lácová、Renata Gašparová、Pavol Koiš、Andrej Boháč、Hafez M. El-Shaaer
DOI:10.1016/j.tet.2009.11.057
日期:2010.2
The synthesis of phenyl, phenylsulfanyl and phenylselanyl substituted pyrano[3,2-c]chromenes 4 is accomplished via cyclocondensation of 4-oxo-4H-chromen-3-carbaldehydes 1 with appropriately substituted acetic acids 2 under mild conditions. Further treatment of 4 with alcohol or water led to 5-alkoxy- and 5-hydroxy-2H,5H-pyrano[3,2-c]chromen-2-ones 5 and 6, respectively. Acid and thermal catalysed rearrangement
苯基,苯基硫烷基和苯基硒基取代的吡喃并[3,2- c ]苯并二甲基苯并[ 4 ]的合成是通过在适当的条件下将4-oxo-4 H -chromen-3-carbaldehydes 1与适当取代的乙酸2进行环缩合而完成的。用醇或水进一步处理4分别导致5-烷氧基-和5-羟基-2 H,5 H-吡喃并[3,2 - c ]铬-2--2-酮5和6。酸和热催化重排4 – 6得到5-羟基吡喃并[2,3 - b ] chromen-2(10a H)-一7和他们随后的取代导致5-烷氧基衍生物8。4与酰胺的反应导致5-酰基氨基或5-苯基磺氨基取代的2 H,5 H-吡喃并[3,2 - c ]铬-2-酮9。反应在加热或微波辐射下进行。