Footprint Catalysis. VI. Chiral “Molecular Footprint” Catalytic Cavities Imprinted by a Chiral Template, Bis(N-benzyloxycarbonyl-L-alanyl)amine, and Their Stereoselective Catalyses
Footprint Catalysis. VI. Chiral “Molecular Footprint” Catalytic Cavities Imprinted by a Chiral Template, Bis(<i>N</i>-benzyloxycarbonyl-L-alanyl)amine, and Their Stereoselective Catalyses
Chiral “molecular footprint” catalytic cavities were formed on a silica(alumina) gel surface by molecular imprinting with a chiral template, bis(N-benzyloxycarbonyl-l-alanyl)amine. These cavities exhibited stereoselective catalyses in the transacylation of the corresponding substrates: l-, d-, and meso- forms of bis(benzyloxycarbonyl-alanyl) oxide.
An unconventional approach to peptidecyclization involving the use of acyl ammonium species was developed. Rapid and epimerization/dimerization-free cyclization of synthetically challenging peptides was possible, including a difficult cyclization reaction involving N-methyl amide bond formation. The approach is characterized by ease of purification of the products, high productivity, and high reaction