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  • Title: New phenylpropanoid and 6H-dibenzo[b,d]pyran-6-one derivatives from the stems of Dasymaschalon rostratum.
    Author: Yu ZX, Niu ZG, Li XB, Zheng CJ, Song XM, Chen GY, Song XP, Han CR, Wu SX.
    Journal: Fitoterapia; 2017 Apr; 118():27-31. PubMed ID: 28229940.
    Abstract:
    Three new phenylpropanoid derivatives, dasymaroacid A (1), dasymaroesters B and C (2 and 3), and one new polyoxygenated 6H-dibenzo[b,d]pyran-6-one derivative dasymarolactone D (4), together with seven known compounds (5-11), were isolated from the stems of Dasymaschalon rostratum Merr. Compounds 1 and 2 are unusual phenylpropanoid derivatives with a polymethyl substituted cyclopentene conjugated diketone as a substituent, and 3 is a unique cinnamic acid detective with a polymethyl substituted cyclohexene conjugated triketone as a substituent. Their structures were elucidated by extensive spectroscopic methods and chemical method, and 4 was further confirmed by the single crystal X-ray diffraction method. Compounds 1-4 and 7 showed weak anti-HIV-1 activities with EC50 values ranged from 16.44 to 25.91μM.
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