title: An unusual cationic [2 + 2] cycloaddition in a divergent total synthesis of hongoquercin A and rhododaurichromanic acid A.
abstract: An unusual polyene cyclization pathway that led to a divergent total synthesis of hongoquercin A and rhododaurichromanic acid A is described here. This work uncovered a unique cationic cyclobutane formation that could be relevant to the biosynthetic pathway for the formation of cyclobutane containing terpenoids in addition to rhododaurichromanic acids.
authors: Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, USA.
authors: Aleksey V
authors: AV
authors: Kurdyumov
authors: Richard P
authors: RP
authors: Hsung