Kallolide A acetate pyrazoline

Abstract

In the crystal structure of kallolide A acetate pyrazoline [systematic name: 7-methyl-16-oxo-4,10-bis(prop-1-en-2-yl)-17,18-dioxa-14,15- diazatetracyclo[9.4.2.1 6,9.0 1, 2]octadeca-6,8,14-trien-5- yl acetate], C 23H 28N 2O 5, there is a 12-membered carbon macrocyclic structure. In addition, there is a trisubstituted furan ring, an approximately planar γ-lactone ring [maximum deviation of 0.057(3) Å] and a pyrazoline ring, the latter in an envelope conformation. The pyrazoline and the γ-lactone rings are fused in a cis configuration. In the crystal, molecules are linked by weak C-H··· O interactions, forming a two-dimensional network parallel to (001). An intramolecular C-H··· O hydrogen bond is also present.