反应详情

To a solution of methyl 5-methoxy-2-methyl-3-indenylacetate 8.7 g (0.037 mol) and 2,3,4-trimethoxybenzaldehyde, 7.99 g (1.1 equivalent) is added 16+ ml (2.0+ equivalents) of 25% methanolic sodium methoxide. The mixture is stirred at reflux under nitrogen for 2 hours. An equal volume of water is added dropwise and refluxing continues for 30 min. The solution is cooled, diluted with water and extracted with ether (3×). Residual ether is blown off with nitrogen, and then the aqueous solution is acidified with 50% glacial acetic acid. The precipitated product is collected and washed thoroughly with water. The crude product is crystallized to give 5-methoxy-2-methyl-1-(2,3,4-trimethoxybenzylidene)-3-indenyl acetic acid. (R and R1 =H, R2 =OCH3, R3 and R4 =H, R5, R6 and R7 =OCH3, R8 =CH3, R9 =H, R10 and R11 =double bond, m=0, n=0, M=OH)

1. temperatureat reflux under nitrogen for 2 hours
2. temperaturerefluxing
3. temperatureThe solution is cooled
4. extractionextracted with ether (3×)
5. customThe precipitated product is collected
6. washwashed thoroughly with water
7. customThe crude product is crystallized