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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
Published on: February 6, 2019
Concise and Efficient Synthesis of Sequentially Isomeric Hetero[3]rotaxanes
Christopher K Lee1, Yuanning Feng2, Mohammad Tajik1
1School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia.
Abstract:
Stereoisomerism, stemming from the spatial orientation of components in molecular structures, plays a decisive role in nature. While the unconventional bonding found in mechanically interlocked molecules gives rise to unique expressions of stereochemistry, the exploration of their stereoisomers is still in its infancy. Sequence isomerism, characterized by variations in the ordering of mechanically interlocked components in catenanes and rotaxanes, mirrors the sequence variations found in biological macromolecules. Herein, we report the use of artificial molecular pumps for the precise and simple production of sequentially isomeric hetero[3]rotaxanes. Utilizing redox-driven pumping cassettes with different rings, we have synthesized two hetero[3]rotaxane isomers in high isolated yields from two [2]rotaxanes. This research represents a significant advance in sequential molecular assembly, paving the way for the development of sophisticated, functionalized, mechanically interlocked materials.
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