Novel Organocatalysts for Asymmetric Synthesis: Efficiency, Sustainability, and Industrial Potential

Abstract

           A major aim of modern organic chemistry is to develop efficient, sustainable and scalable methods of asymmetric synthesis. Eight new small molecule organocatalysts have been synthesized and their structural, physical and catalytic characteristics were investigated. Catalyst V was superior to the others, with a high yield (73%), good solubility, air- and temperature stability, and excellent recyclability. The asymmetric metal free synthesis of different derivatives of spiro-isoxazoline (3a–3j) was performed under moderate reaction conditions, and good yields (76–88%) were achieved for various functional groups, which highlighted its catalytic activity. The purity and structures of the products were verified by extensive spectroscopic study (¹H NMR, ¹³C NMR, IR, ESI-MS). Thus, aside from confirming Catalyst V to be a suitable organocatalyst for stereoselective transformations, this work extends organocatalysis to a scalable and environmentally-friendly system of chemical synthetic pathways. The technology provides an attractive substitute for traditional metal catalyzed approaches used for industrially relevant asymmetric synthesis and is in line with sustainable chemistry principles.