| 摘要 |
Title complds (I; A = alkyl, NO2, halo, amino, optionally substituted OH, acyl, sulfamoyl), useful as medicine, were prepd. by decarboxylic acid from II. Thus, 4',5'-dihydrospiro [benzo[b furan-2(3H),3'(2'H)-furan -2',3-dione 1.75 g, Nacl 552mg and dimethylsulfoxide 9ml were stirred for 2hr at 155oC under N2, poured in cold water, and the obtained precipitate was filtrated and recrystallized in EtOH-H2O(3:2) to give 1.21 g spiro[benzo[b furan-2(3H),1' -cyclopropan -3-one (m.p. 89-90.5oC).
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