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Isomeric ent ‐Labdane‐Type Diterpenoids from the Stems of Rhizophora mucronata
Author(s) -
Madhu Ankireddy,
Suresh Chandra Venkata Appa Rao Annam,
Sushma Sukki,
Mangala Gowri Ponnapalli,
Venugopal Raju Tuniki
Publication year - 2014
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.201400022
Subject(s) - labdane , rhizophora mucronata , chemistry , moiety , stereochemistry , absolute configuration , diterpene , mangrove , ecology , biology
Abstract Two new constitutional isomers of ent ‐labdane‐type diterpenoids, 1 and 2 , with an unusual seven‐membered lactone moiety ( i.e. , 1 ), together with two known compounds, 3 and 4 , were isolated from the acetone extract of Rhizophora mucronata. Their structures were elucidated as rhizomucronol A and B ( 1 and 2 , resp.) by spectroscopic analyses and chemical evidence. The absolute configuration of 2 was established by applying the Mosher ester procedure.