Artículos de revistas
Short Total Synthesis of (-)-Lupinine and (-)-Epiquinamide by Double Mitsunobu Reaction
Registro en:
SYNTHESIS-STUTTGART Issue: 1 Pages: 51-56 DOI: 10.1055/s-0030-1258356
0039-7881
Autor
Santos, L.S.
Mirabal-Gallardo, Y.
Shankaraiah, N.
Simirgiotis, M.J.
Institución
Resumen
Santos, LS (Silva Santos, Leonardo. Univ Talca, Chem Inst Nat Resources, Lab Asymmetr Synth, Talca, Chile Alternative total syntheses of (-)-lupinine (1) and (-)-epiquinamide (2) have been described via the key intermediate 3 obtained from the addition of 2-trialkylsilyloxyfuran 5 to N-acyliminium intermediate derived from 4. The major R, R-isomer 8 obtained from the Mannich reaction was converted into its R, S-isomer through Mitsunobu reaction. Then, a second Mitsunobu reaction of 3 led to cyano 9 and azido 11 derivatives, which were converted into 1 and 2 in 33 and 36% overall yield from 4, respectively. The synthetic route is amenable for the generation of several quinolizidine alkaloids.