Tetrahedron p. 1839 - 1844 (1989)
Update date:2022-08-04
Topics:
Parmar, Virender S.
Singh, Suddham
Vardhan, Anand
Sharma, Rita
The constitution of nivegin, occurring in Echinops niveus has been revised by synthesising 5,7-dihydroxy-4-(4-hydroxyphenyl)-2H-1-benzopyran-2-one(1), 5,7-dihydroxy-3-(4-hydroxyphenyl)-2H-1-benzopyran-2-one(2) and their derivatives 3-6.It has been assigned a novel structure having the phenyl substituent in the benzenoid ring of the coumarin nucleus - 4,5-dihydroxy-7-(4-hydroxyphenyl)-2H-1-benzopyran-2-one(11).
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