sesquiterpenoids, laurokamurols A–C (1–3), along with eight known related monomeric ones (4–11) were isolated from the East China Sea redalga Laurencia okamurai Yamada. The absolute configurations of the new bis-sesquitepenoids, especially their axial chirality, were determined by extensive spectroscopic analyses and TDDFT-ECD method. All of the new compounds showed promising PTP1B inhibitory activities with IC50
Abstract From the redalgaLaurencia nidifica a new sesquiterpene of cyclolaurane-type was isolated, and the structure elucidated by spectral analyses and chemical means.
The first synthesis of (−)-laurequinone, cyclolaurane-type sesquiterpenoid isolated from the red alga Laurencia nidifica, has been achieved by using an intramolecular Heck reaction and an insertion of carbene as the key steps for the construction of quaternary carbon at the benzylic position and cyclopropane ring, respectively.