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Two new butenolide derivatives from Saussurea katochaete
1State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, P. R. China.
Abstract:
Two new butenolide derivatives, (4R,7R*/S*)-2, 4-dimethyl-4- (1'-acetyl-3'-oxobutyl)-2- butenolide and its epimer, (4R,7S*/R*)-2, 4-dimethyl-4- (1'-acetyl-3'-oxobutyl)-2- butenolide were isolated from the acetone extract of the whole plant of Saussurea katochaete. Their structures were established by various spectral methods including IR, 1D-, 2D-NMR and HR-ESIMS. Four known compounds were also isolated and identified as 2, 4-dimethyl-4-hydroxy-2- butenolide, 3-hexene-2, 5-dione, 3-hydroxyhexane-2, 5-dione, 1-hydroxy-(Z)-3-hexene-2, 5-dione.
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