treatment of tertiary and secondary allylicalcohols containing a terminal double bond, and their acetyl derivatives, with triphenylphosphine and iodine under mild conditions leads regiospecifically and in high stereoselectivity to the corresponding primary allylic iodides, which can react ‘in situ’ with diverse nucleophiles. Primary allylicalcohols and benzyl alcohols and acetates are also transformed
Eight new and seven known labdanediterpenes were identified in the oleoresin of Araucaria cooki.
在南洋杉的油树脂中鉴定出 8 种新的和 7 种已知的拉丹二萜。
Enantiospecific synthesis of antifungal dasyscyphin E from cupressic acid
作者:Antonio Fernández、Ettahir Boulifa、Fermín Jiménez、Soumicha Mahdjour、Ahmed I. Mansour、Rachid Chahboun、Enrique Alvarez-Manzaneda
DOI:10.1016/j.tet.2017.09.048
日期:2017.11
The first synthesis of the sesquiterpene quinol dasyscyphin E has been achieved starting from cupressic acid. Key steps of the synthetic sequence are the oxidative degradation of the diterpene side chain to give a methylketone, the diastereoselective α-methylation of a protected ketoaldehyde, the subsequent intramolecular aldol condensation and the further Diels-Aldercycloaddition of a dienol ester