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Note | Regular issue | Vol 71, No. 11, 2007, pp.2477-2490
Published online, 3rd August, 2007
DOI: 10.3987/COM-07-11089
Prenylated Flavonoids from Tephrosia apollinea

Mohamed H. Abd El-Razek,* Abou El-Hamd H. Mohamed, and Ahmed A. Ahmed

*National Research Center, Natural Products Chemistry Department, El-Tahrir, St., Dokki, Cairo 12622, Egypt

Abstract

Re-investigation of the chloroform extract of the aerial part of Tephrosia apollinea afforded seven new 8-prenylated flavonoids namely tephroapollin A-G (1-7). The structures were established by spectroscopic methods, including HR-CI-MS, 1H, 13C, DEPT, HMQC, HMBC and ROESY experiments. The relative configuration analysis of stereocenters for 5-7 was carried out on the basis of the reported J-based method. General toxicity of the isolated compounds was determined by brine shrimp lethality bioassay.