Broadening the Synthetic Scope of the Iron(III)-Catalyzed Aza-Prins Cyclization
作者:Rubén M. Carballo、Guillermo Valdomir、Martín Purino、Víctor S. Martín、Juan I. Padrón
DOI:10.1002/ejoc.200901372
日期:2010.4
The nature and influence of the N-sulfonyl group in aza-Prinscyclization and the reactivity of the six-membered aza-cycle generated has been studied. The aza-Prinscyclization of γ,δ-unsaturated amines with a tosyl group at the nitrogen atom produces 2-alkyl-4-halo-1-tosyl-1,2,5,6-tetrahydropyridines with a halovinyl function, extraordinarily stable to further derivatization and detosylation conditions
A series of functionalized N-sulfonyl-piperidines and N-sulfonyl-tetrahydropyridines were evaluated for their
antiproliferative activity against the representative panel of human solid tumor cells A2780 (ovarian), SW1573 (non-small
cell lung) and WiDr (colon). The SAR study showed for WiDr cells a correlation between the biological activity and the
length of the N-sulfonyl group, the nature of the substituents and the type of alkyl side chain. Further QSAR studies indicate
that the size and nature of the N-sulfonyl group, the atomic polarizability (MP) and the partition coefficient are the
most important descriptors for the activity. The major contribution is the size (F05C-S) of the N-sulfonyl group.