Received 12 November 2012
aInstitute of Applied Physics of the Academy of Sciences of Moldova, 5 Academy Street, MD-2028, Chisinau, Republic of Moldova,bDepartment of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX 78666, USA,cDipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Universitario Monte S. Angelo, Via Cinthia 4, Napoli 80126, Italy, and dDepartment of Chemistry & Biology, New Mexico Highlands University, 803 University Avenue, Las Vegas, NM 87701, USA
Correspondence e-mail: email@example.com
The title natural compound, isolated from Narcissus pseudonarcissus var. King Alfred crystallizes as a hemihydrate, C14H13NO7·0.5H2O, with four crystallographically independent dioxolophenanthridinone molecules and two crystallographically independent solvent water molecules in the asymmetric unit. All four crystallographically independent dioxolophenanthridinone molecules are geometrically very similar and differ only in the orientations of the three hydroxy groups at the terminal cyclohexene rings. The five-membered dioxolane ring has a planar conformation (the r.m.s. deviations are 0.010, 0.019, 0.025 and 0.004 Å, for the four crystallographically independent molecules), and the six-membered dihydropyridone and cyclohexene rings adopt sofa conformations in each molecule. The flattened structure of each dioxolophenanthridinone molecule is supported by a strong intramolecular O-HO hydrogen bond. The N atom has a slightly pyramidalized configuration. In the crystal, the dioxolophenanthridinone molecules form layers parallel to (101) with O-HO and N-HO hydrogen bonds linking the dioxolophenanthridinone molecules both within and between the layers and the water molecules, forming a three-dimensional framework. The absolute configurations of the chiral centers are 2S, 3R, 4S and 4aR.
For general background to narciclasine, see: Ceriotti (1967a,b); Ceriotti et al. (1967); Kornienko & Evidente (2008). For the crystal structures of related compounds, see: Savona et al. (1970); Immirzi & Fuganti (1972); Bi et al. (1998); McNulty et al. (2011).
Data collection: CrysAlis PRO (Agilent, 2012); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: RK2387 ).
The authors are grateful to Dr Sergey Lindeman for help with this work and to the NSF for support via DMR grant 0934212 (PREM) and CHE 0832622.
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