At the first step, acyclic cyanosulfonamides 95 or their monocyclic derivatives 96 are formed without separation from the reaction mixture. These intermediates then rapidly undergo the subsequent CSIC process, wherein Et3N catalyzes the formation of carbanions 97 or 98, leading to cyclization and the formation of 5,5-dialkyl-or 5,5methylphenyl-substituted 99 and spirocyclic 100 γsultamcarboxylates. The complete conversion of sulfonamides 95 and 96 into CSIC reaction products is achieved by refluxing the reaction mixture for 4 h. This results in the synthesis of enaminosultam carboxylates 99 and 100 in 8-85% yield. Scheme 12. One-pot synthesis of β-enamino-γ-sultam-αcarboxylates 99 and 100