2-Oxy and 2-thio-2,3-dihydrobenzofuranyl-5-aminosulfonates

A substituted benzofuranyl ester of the formula ##SPC15##

• where R.sup.1, R.sup.2 and R.sup.3 are identical or different and each denotes hydrogen or alkyl of 1 to 3 carbon atoms, or R.sup.1 and R.sup.2 together, or R.sup.2 and R.sup.3 together, denote alkylene of 2 to 5 carbon atoms, R.sup.4 denotes hydroxy, alkoxy of 1 to 5 carbon atoms, alkenyloxy of 2 to 4 carbon atoms, alkynyloxy of 2 to 4 carbon atoms, methylmercapto, ethylmercapto, propylmercapto, benzylmercapto, .beta.-phenylethylmercapto, p-chlorobenzylmercapto, phenoxy, nitrophenoxy, the group OCOR.sup.12, where R.sup.12 denotes alkyl of 1 to 4 carbon atoms, allyl, methallyl, propargyl, butynyl, phenyl, tolyl, chlorophenyl, nitrophenyl, methylamino, dimethylamino, methoxy, ethoxy, propoxy, allyloxy, chloroallyloxy, propargyloxy, chlorobutynyloxy, phenylamino, tolylamino, chlorophenylamino or phenoxy, tolyloxy and chlorophenyloxy, R.sup.5 and R.sup.6 are identical or different and each denotes hydrogen, alkyl of 1 to 4 carbon atoms and chloro substituted alkyl of 1 to 4 carbon atoms, and R.sup.7, R.sup.8 and R.sup.9 are identical or different and each denotes hydrogen, methyl, ethyl, chloro, bromo, cyano, acetyl or methoxy.