Efficient Chemoenzymatic Synthesis of (2,3)-3-Hydroxy-3-Methylproline, a Key Fragment in Polyoxypeptin A and FR225659
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We report an efficient synthesis of protected (2,3)-3-hydroxy-3-methylproline that proceeds in three steps with complete stereoselectivity. This route represents a significant improvement over previous approaches to this noncanonical amino acid. Key to this success is the development of a one-pot chemoenzymatic procedure for the preparation of (2,3)-3- methylproline from L-isoleucine. This work lays the foundation for future chemoenzymatic syntheses of polyoxypeptin A and FR225659.
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