| 摘要 |
Title compds. (I; A = amino-substituted benzene ring), useful as a pharmaceutical intermediate, were prepd. by alkylation or acylation of III obtained from II(A' = benzene ring). Thus, a compd. contg. 1.75 g 4',5-dihydrspiro benzo-(b)furan-2(3H),3'(2'H)-furan -2',3-dione, 552 mg sodium chloride and 9 ml dimethylsulfoxide was stirred in N2 gas at 155oC for 2 hr to give 1.21 g spiro[benzo(b)furan-2(3H),1'-cyclopropan -3-one.
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