482-83-7Relevant articles and documents
High-selectivity preparation method for 7-methoxy-6/8-hydroxy coumarin
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Paragraph 0036; 0037; 0038, (2017/08/28)
The invention provides a high-selectivity preparation method for 7-methoxy-6/8-hydroxy coumarin and belongs to the field of synthesis of natural medicines. The method comprises the steps of subjecting a catechol coumarin compound to a high-selectivity methylation reaction with a methylation reagent in a proper base catalyst added organic reaction system, so as to obtain a 7-hydroxyl mono-methylate, wherein the mole ratio of a base to the catechol coumarin compound is (2.0 to 7.0): 1, the mole ratio of the methylation reagent to the catechol coumarin compound is (1.0 to 3.0): 1, the temperature of the organic reaction system is 0 DEG C to 30 DEG C, and the reaction time is 1.0 to 5.0 hours. The method has the characteristics of simplicity in operation, moderate conditions, good selectivity, high yield and the like and can be applied to the preparation of mono-methylates of coumarin catechols with different types of substituents.
Synthesis of 4-arylcoumarins via Cu-catalyzed hydroarylation with arylboronic acids
Yamamoto, Yoshihiko,Kirai, Naohiro
supporting information; experimental part, p. 5513 - 5516 (2009/05/27)
(Chemical Equation Presented) In the presence of 2-4 mol % of CuOAc, methyl phenylpropiolates having a MOM-protected hydroxy group at the ortho position underwent hydroarylation with various arylboronic acids in MeOH at ambient temperature, resulting in the formation of 4-arylcoumarins in high yields after the acidic workup. This method was effectively used for the synthesis of biologically active natural and artificial compounds.