np0c00354_si_001.pdf (1.49 MB)
Pterolobirins A and B, Oxygen-Bridged Cassane Diterpenoid Dimers from the Fruits of Pterolobium macropterum
journal contribution
posted on 2020-06-30, 12:37 authored by Achara Raksat, Thammarat Aree, Khanitha PudhomTwo dimeric cassane diterpenoids
with an unprecedented 6/6/6/6/6/5/6/6/6
nonacyclic framework, pterolobirins A and B (1 and 2), were isolated from the fruits of Pterolobium macropterum. Their structures were assigned by interpreting the spectroscopic
data. The absolute configuration of 1 was unequivocally
confirmed by single-crystal X-ray diffraction data. A putative biosynthetic
pathway is proposed based on a regular intermolecular Diels–Alder
reaction and an intramolecular nucleophilic addition.