合成路线1

Compound can be prepared in several different ways: 1) The reaction of 2-acetyl-7-hydroxybenzofuran (I) with epichlorohydrin by means of piperidine hydrochloride (A) at 105 C gives 2-acetyl-7-(2,3-epoxypropoxy)benzofuran (II), which is then condensed with isopropylamine (B) in refluxing ethanol. 2) By reaction of (I) with 1-chloro-3-isopropylamino-2-propanol (C) by means of NaOH at 80 C in a sealed tube. 3) By reductocondensation of 2-[1,1-(ethylenedioxy)ethyl]-7-[2-oxo-3-(hydroxyimino)propoxy]benzofuran (III) with acetone by means of H2 and PtO2 in ethanol, followed by hydrolysis of the reduced product with HCl in ethanol. 4) The reaction of 2-[1,1-(ethylenedioxy)ethyl]-7-glyoxylmethoxybenz-furan (IV) with isopropylamine (B) in ethanol gives the corresponding Schiff base (V), which is then reduced with NaBH4 and hydrolyzed with HCl in ethanol. 5) By hydrolysis of 3-isopropyl-5-(2-acetyl-7-benzofuryloxymethyl)oxazolidinone (VI) with aqueous refluxing NaOH. 6) By reaction of 2-acetyl-7-(2-hydroxy-3-aminopropoxy)benzofuran (VII) with isopropyl bromide (D) in ethanol at 100 C.