Tinctorin, a new spiroterpenoid from the lichen <i>Parmotrema tinctorum</i> (Despr. ex Nyl.) Hale growing in Vietnam
Phan-Si-Nguyen Dong, Hoang-Vinh-Truong Phan, Jirapast Sichaem, Hoai-Vu Nguyen-Si, Thanh-Nha Tran, Le-Thuy-Thuy-Trang Hoang, Thi-Minh-Suong Huynh, Huong Thi Thu Le, Dinh‐Tri Mai, Tung-Lam Ngo, Tien Dung Le, Van‐Kieu Nguyen
Abstract
A new spiroterpenoid, namely tinctorin (1), along with one known compound, norreticulatin (2), were isolated from the lichen Parmotrema tinctorum (Despr. ex Nyl.) Hale. Their structures were elucidated by extensive spectroscopic analyses and electronic circular dichroism (ECD) calculations. The absolute configuration of 2 was established for the first time. Compound 1 was evaluated for its inhibitory activity against α-glucosidase and found to be inactive.
Topics & Concepts
LichenCircular dichroismChemistryStereochemistryBotanyBiologyLichen and fungal ecologyBryophyte Studies and RecordsBotany and Plant Ecology Studies