Аннотация:
A strategy in the synthesis of 1,5- or 3,7-unsubstituted derivatives of the title dilactams has been developed, and the parent 3,7-diazabicyclo[3.3.1]nonane-2,6-dione 4 was synthesised; the hydrogen bonding generated self-assembly as a heterochiral infinite diagonal zigzag tape was found in the crystal of 2 (space group P21/c) whereas a homochiral helical architecture was observed in 4 (space group P212121).