Efficient construction of 8-membered ring framework of vinigrol through SmI2-induced coupling cyclization
摘要:
The 8-membered ring framework of vinigrol, a unique tricyclic diterpene isolated as a novel antihypertensive compound from a culture of Virgaria nigra, was efficiently synthesized employing an SmI2-induced intramolecular coupling. It is particularly noteworthy that the 8-membered carbocycle was cyclized in quantitative yields under non-high-dilution conditions. (C) 1999 Elsevier Science Ltd. All rights reserved.
A new strategy was developed for the asymmetrictotalsynthesis of (-)-vinigrol. The strategy involved a linear sequence of 15 steps from 3-methyl-butanal (14 steps from chloro-dihydrocarvone) and did not need protecting groups. The synthetically challenging 1,5-butanodecahydronaphthalene core was constructed efficiently via a type II intramolecular [5+2] cycloaddition, followed by a unique ring-contraction
The 8-membered ring framework of vinigrol, a unique tricyclic diterpene isolated as a novel antihypertensive compound from a culture of Virgaria nigra, was efficiently synthesized employing an SmI2-induced intramolecular Barbier coupling.
The 8-membered ring framework of vinigrol, a unique tricyclic diterpene isolated as a novel antihypertensive compound from a culture of Virgaria nigra, was efficiently synthesized employing an SmI2-induced intramolecular coupling. It is particularly noteworthy that the 8-membered carbocycle was cyclized in quantitative yields under non-high-dilution conditions. (C) 1999 Elsevier Science Ltd. All rights reserved.