Patent ID: 11925650
Assignee: NATIONAL TAIWAN UNIVERSITY
Field: Pharmaceuticals (Chemistry)
Classification: CPC A  C | IPC A  C

Claim 9:
10. The method of claim 9, wherein X1 of the compound (VI) is O and the compound (VI) is obtained by:
(a) under the present of K2CO3, reacting a compound (II) of following structure, with a compound (III) of following structure, to obtain a compound (IV) of following structure;, (b) reacting the compound (IV) with SnCl2 to obtain a compound (V) of following structure;, (c) reacting the compound (V) with H2SO4 to obtain the compound (VI);
wherein
X2 is CH;
X3 is —CHCH;
R1 is H, CH3 or Cl; and
R2 is,