HCID 12767926, compound → HCID 12767927, compound

Participants

Reaction Steps

In 35 ml of ethyl acetate and 3.5 ml of acetic acid was dissolved 356.3 mg of 6-nitro-4',5'-dihydrospiro[benzo[b]thiophen-2(3H),3'(2'H)-furan]-3,2'-dione as obtained in Reference Example 7, and was subjected to catalytic reduction under atmospheric pressure at room temperature in the presence of 113.3 mg of 5% palladium carbon. After absorption of hydrogen stopped, the catalyst was filtered off, and the filtrate was evaporated to dryness under reduced pressure. Recrystallization of the residue from water-acetone (7:3) yielded yellow needles of 6-hydroxyamino-4',5'-dihydrospiro[benzo[b]thiophene-2(3H),3'(2'H)-furan]-3,2'-dione. Melting point: 184°-186° C.

Provenance & Evidence