Crystal structure of 13-(E)-(2-aminobenzylidene)-parthenolide

Shobanbabu Bommagani, Narsihma R. Penthala, Sean Parkin, Peter A. Crooks

Research output: Contribution to journalArticlepeer-review

Abstract

The title compound, C21H25NO3 [systematic name: (1aR,4E,7aS,8E,10aS,10bR)-8-(2-aminobenzylidene)-1a,5-dimethyl-2,3,6,7,7a,8,10a,10b-octahydrooxireno[2′,3′:9,10]cyclodeca[1,2-b]furan-9(1aH)-one], was synthesized by the reaction of parthenolide [systematic name (1aR,7aS,10aS,10bS,E)-1a,5-dimethyl-8-methylene-2,3,6,7,7a,8,10a,10b-octahydrooxireno[2′,3′:9,10]cyclodeca[1,2-b]furan-9(1aH)-one] with 2-iodoaniline via Heck reaction conditions. The molecule is composed of fused ten-, five- (lactone), and three-membered (epoxide) rings. The lactone ring shows a flattened envelope-type conformation (r.m.s. deviation from planarity = 0.0477 Å), and bears a 2-aminobenzylidene substituent that is disordered over two conformations [occupancy factors 0.901 (4) and 0.099 (4)]. The ten-membered ring has an approximate chair-chair conformation. The dihedral angle between the 2-aminobenzylidine moiety (major component) and the lactone ring (mean plane) is 59.93 (7)°. There are no conventional hydrogen bonds, but there are a number of weaker C - H⋯O-type interactions.

Original languageEnglish
Pages (from-to)1543-1546
Number of pages4
JournalActa Crystallographica Section E: Crystallographic Communications
Volume74
DOIs
StatePublished - 2018

Bibliographical note

Funding Information:
This work was supported by NIH/NCI grant CA158275. SP thanks the National Science Foundation (NSF) MRI program for grants CHE0319176 and CHE1625732.

Publisher Copyright:
© 2018 Bommagani et al.

Keywords

  • 2-iodoaniline
  • Heck product
  • crystal structure
  • parthenolide

ASJC Scopus subject areas

  • Chemistry (all)
  • Materials Science (all)
  • Condensed Matter Physics

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