Cycloastragenol crystal form E and preparation method thereof
A technology of cycloastragaliol and crystal form is applied in the field of organic chemical drug preparation, and can solve the problems of multiple by-products, unstable three-membered ring structure, complicated process and the like
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[0037] Add 250 mg of cycloastragenol to 1.5 ml of methanol to prepare a 166 mg / ml cycloastragenol methanol solution, heat to reflux, and reflux for 2 to 4 hours to completely dissolve cycloastragenol, filter while it is hot, and cool the filtrate to 0 to 5 After ℃, add 9ml of n-heptane, seal with a parafilm, pierce, volatilize, crystallize at 0-5℃ for 2-4 days, filter, collect the solid, and dry under reduced pressure at 50℃. Yield: 97.1%, HPLC purity: 99.95%.
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