7,2'-dehydration puerarin, salt derivatives as well as preparation method and application thereof

technical field The invention relates to puerarin derivatives and their preparation methods and applications, in particular to 7,2"-anhydropuerarin and its salt derivatives and their preparation methods and applications, belonging to the technical field of medicine. Background technique Puerarin is a kind of isoflavone glycoside extracted from the roots of Pueraria mirifica and Pueraria vine, which is a leguminous plant. Studies have found that it can scavenge free radicals (J.Agric.Food Chem.2002, 50, 7504-7509.), lower serum cholesterol (J.Nat.Prod.2003, 66, 788-792.), anticoagulant and antiallergic (Biol.Pharm.Bull.2002, 25, 1328-1332.) and other activities, clinically used for the treatment of coronary heart disease (Chinese Journal of Integrated Traditional Chinese and Western Medicine 2003, 23, 895-897.), angina pectoris (Chinese Journal of Integrated Traditional Chinese and Western Medicine 1998, 18, 282-284.), myocardial infarction (Chinese Med.J.1992, 105, 11-17.) ...