for the following products
2-Amino-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carboxylic acid ethyl ester | Ethyl 2-amino-5,6,7,8-tetrahydro-4H-cyclohepta[b]thiophene-3-carboxylate | Ethyl 2-aminocyclopenta[b]thiophene-3-carboxylate and Ethyl 2-amino-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carboxylate
