tailieunhanh - Study on benzopyrans and other isolated compounds from mallotus apelta

During the last decades, dozens of compounds have been isolated from Mallotus apelta. These compounds which are classified under the categories viz. terpenoids, steroids, flavonoids, cumarino-lignoids, cembrane diterpenoids, and benzopyranoids. They were known to exhibit interesting biological activities. The phytochemical investigations revealed that malloapelta B which was the major component of M. apelta, showed strong NF- B and NFAT transcription factor inhibitory and cytotoxic activities. Numerous studies on the synthesis of some derivatives of malloapelta B were carried out. This paper reviews the progress on the isolation, structure elucidation and biological activities of secondary metabolites from M. apelta, especially, the new structures of benzopyrans. Chemical modifications of malloapelta B and structure-activity relationship were also discussed. | Journal of Chemistry Vol. 45 Special issue P. 111 -121 2007 REVIEW STUDY ON BENZOPYRANS AND OTHER ISOLATED COMPOUNDS FROM MALLOTUS APELTA Received 15 October 2007 NGUYEN HOAI NAM1 NGUYEN HAI DANG1 PHAN VAN KIEM1 LUU VAN CHINH1 PHAN THI BINH2 LA DINH MOI3 AND CHAU VAN MINH1 institute of Natural Products Chemistry VAST institute of Chemistry VAST institute of Ecology and Biological Reources VAST SUMMARY During the last decades dozens of compounds have been isolated from Mallotus apelta. These compounds which are classified under the categories viz. terpenoids steroids flavonoids cumarino-lignoids cembrane diterpenoids and benzopyranoids. They were known to exhibit interesting biological activities. The phytochemical investigations revealed that malloapelta B which was the major component of M. apelta showed strong NF-kB and NF AT transcription factor inhibitory and cytotoxic activities. Numerous studies on the synthesis of some derivatives of malloapelta B were carried out. This paper reviews the progress on the isolation structure elucidation and biological activities of secondary metabolites from M. apelta especially the new structures of benzopyrans. Chemical modifications of malloapelta B and structure-activity relationship were also discussed. Keywords Mallotus mallotus apelta benzopyran malloapelta b. I - INTRODUCTION Ba bet Mallotus genus comprises about 140 species distributed in regions from South to South-East Asia such as in Malaysian region about 75 species in China about 40 species and in Vietnam about 40 species 1 . Mallotus species have been used in traditional medicine to treat various diseases. For example Mallotus apelta has been used to treat chronic hepatitis hepatalgia enteritis diarrhea lymphopathy Mallotus repandus has been used to treat influenza and fever Mallotus barbatus has been used in both Vietnamese and Chinese folk medicine as antipyretic diuretic relieving pain and curing cholera Mallotus macrostachyus has been used to treat wounds .

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