Solid-phase total synthesis of the pentacyclic system lamellarins U and L.
[reaction: see text] A total solid-phase synthesis of lamellarins U and L has been achieved. The conversion of an aldehyde group into a formate by a Baeyer-Villiger reaction and a intramolecular [3 + 2] cycloaddition of a 3,4-dihydroisoquinolinium salt over a triple bond comprise the key steps of the process. Each transformation has been controlled with the proper spectroscopic and analytical methods.
Cironi
Pablo
P
Laboratory of Organic Chemistry, Faculty of Pharmacy, University of Barcelona, 08028 Barcelona, Spain.
Manzanares
Ignacio
I
Albericio
Fernando
F
Alvarez
Mercedes
M