Journal
TETRAHEDRON LETTERS
Volume 56, Issue 42, Pages 5735-5737Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2015.08.071
Keywords
Cephalotaxus alkaloid; Cephalotaxine; Electronic circular dichroism; Secondary metabolites
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Funding
- National Natural Science Foundation of China [30971902]
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A novel Cephalotaxus alkaloid with an N-alkyl-3-benzazepine skeleton, cephalofortunone (1), and known congeners, cephalotaxine, drupacine, and demethylcephalotaxinone, were isolated from the stems of Cephalotaxus fortune Hook. f. Their structures were elucidated on the basis of spectroscopic data. The absolute configuration of 1 was assigned by the comparison of its experimental solution CD spectrum with the TDDFT-calculated one on DFT-optimized geometries. This is the first cephalotaxine derivative with an N-alkyl chain rather than 1-azaspiro[4.4]nonane moiety from Cephalotaxus spp. (C) 2015 Elsevier Ltd. All rights reserved.
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