The organocatalyzed Mannich coupling of cyclic carboxaldehydes allowed the concise and simple preparation of spirocyclic aminolactones. Their conversion into pharmaceutically relevant spiro[4.5]cyclic and spiro[4.6]cyclic 3-aminopyrrolidines is also described.
Key words
Mannich reaction - spiro[4.5]decanes - spiro[4.6]undecanes - aminolactones - 3-aminopyrrolidines