Efficient Synthesis of 6-O-methyl-scutellarein from Scutellarin via Selective Methylation

Author(s):

Min-Zhe Shen, Zhi-Hao Shi, Nian-Guang Li, Hao -Tang, Qian-Ping Shi, Yu-Ping Tang, Jian-Ping Yang and Jin-Ao DuanPages 733-737 (5)

Abstract:

Scutellarin (1) possesses distinguished efficacy in the clinical therapy of cerebral infarction, coronary heart disease, and angina pectoris. Scutellarin (1) is readily converted in vivo, therefore, synthetic methods for the construction of its metabolites will be very important in the near future. In this work, an efficient and first synthetic method for 6-O-methyl- scutellarein (3), one metabolite of scutellarin in vivo, is developed. Dichlorodiphenylmethane in diphenyl ether is used firstly to protect the dihydroxy groups at C-6 and C-7 in scutellarein (2). Then, benzyl bromide is used to selectively protect the hydroxy groups at C-4′ and C-7 in 10. 6-O-Methyl-scutellarein (3) is obtained in high yield through seven steps.

Keywords:

6-O-methyl-scutellarein, metabolite, scutellarin, synthesis, regioselective protection.

Affiliation:

Jiangsu Key Laboratory for High Technology of TCM Formulae Research, Nanjing University of Chinese Medicine, Nanjing 210023, P.R. China.

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