| 摘要 |
Provided is a method of synthesizing a compound of formula (I), comprising: (a) reacting a compound of formula (II) wherein R1 and R2 are independently hydrogen, hydroxy(C1-C2)alkyl, or (C1-C2)alkyl with, a coumpound of formula (III) wherein R3, R4, and R5 are each independently of each other hydrogen, (C1-C3)alkyl, (C1-C3)alkoxy, or halogen; and X is a leaving group, in a solvent having a dielectric constant at 20 DEG C of at least 30 but no more than 40; and (b) obtaining the compound (I).
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