Synthesis of the Core Ring System of the Yuzurimine-Type <i>Daphniphyllum</i> Alkaloids by Cascade Condensation, Cyclization, Cycloaddition Chemistry
作者:Iain Coldham、Luke Watson、Harry Adams、Nathaniel G. Martin
DOI:10.1021/jo2000868
日期:2011.4.1
Addition of hydroxylamine to substituted 4-chlorobutanals gives intermediate nitrones that undergo tandem cyclization and then intramolecular dipolar cycloaddition to give the core ringsystem of the yuzurimine-type natural products. Ring-opening of the isoxazolidines gives amino alcohols that can be converted to 1,3-oxazines, representing the tetracyclic core of alkaloids such as daphcalycic acid