Cyclic nucreo-delta-amino acids that constitute monomers of a conformationally constrained nucleo-delta-peptide base-pairing system have been prepared. Their synthesis starts with an enantioselectively catalyzed chirogenic Diels-Alder reaction, proceeds via a regioselective epsilon-iodolactamization process, and ends with a regio- as well as diastereoselective introduction of nucleobases through S(N)2-type opening of a transiently formed N-acylaziridine ring. Extensive use of X-ray crystal-structure analysis has been made to support structure assignments.
Cyclic nucreo-delta-amino acids that constitute monomers of a conformationally constrained nucleo-delta-peptide base-pairing system have been prepared. Their synthesis starts with an enantioselectively catalyzed chirogenic Diels-Alder reaction, proceeds via a regioselective epsilon-iodolactamization process, and ends with a regio- as well as diastereoselective introduction of nucleobases through S(N)2-type opening of a transiently formed N-acylaziridine ring. Extensive use of X-ray crystal-structure analysis has been made to support structure assignments.
Cyclic nucreo-delta-amino acids that constitute monomers of a conformationally constrained nucleo-delta-peptide base-pairing system have been prepared. Their synthesis starts with an enantioselectively catalyzed chirogenic Diels-Alder reaction, proceeds via a regioselective epsilon-iodolactamization process, and ends with a regio- as well as diastereoselective introduction of nucleobases through S(N)2-type opening of a transiently formed N-acylaziridine ring. Extensive use of X-ray crystal-structure analysis has been made to support structure assignments.