Chlorosulfonic acid → HCID 20201791, compound

Participants

Reaction Steps

There was reacted 1 g (5.4 mmole) of 2-cyano-7-ethoxybenzofuran (with chlorosulfonic acid as in Example 1, yielding 0.65 g of 2-cyano-4-chlorosulfonyl-7-ethoxybenzofuran (yield: 43%, MS (m/z): 285 (M+), 257, 250 and 222). The obtained chlorosulfonyl compound was reacted with glycine ethyl ester hydrochloride as in Example 1 to give an ester compound (yield: 46%, MS (m/z): 385 (M+), 279, 250 and 222), which was then hydrolyzed, accompanying the hydrolysis of nitrile, to give 2-carboxy-4-(N-carboxymethylsulfamoyl)-7-ethoxybenzofuran (yellow prisms, yield: 62%). The physical constants are shown in Table 4.

Provenance & Evidence