The synthesis of (1R,2R,3S,9aR) and (1R,2R,3S,9aS) trihydroxy quinolizidine alkaloids 3a and 3b from D-glucose derived nitrone 4 is described. The key transformation involves the 1,3-addn. of allylmagnesium bromide to nitrone 4 that afforded high diastereoselectivity in the presence of TMSOTf. The N-O bond reductive cleavage, N-Cbz protection, ozonolysis, Wittig olefination, lactam formation and reductive amination cascade afforded the target compds. 3a and 3b in good overall yield.

D. D. Dhavale, S. M. Jachak, N. P. Karche, C. Trombini (2004). Synthesis of trihydroxy quinolizidine alkaloids: 1,3-addition reaction of allylmagnesium bromide to a sugar nitrone. TETRAHEDRON, 60, 3009-3016 [10.1016/j.tet.2004.01.085].

Synthesis of trihydroxy quinolizidine alkaloids: 1,3-addition reaction of allylmagnesium bromide to a sugar nitrone

TROMBINI, CLAUDIO
2004

Abstract

The synthesis of (1R,2R,3S,9aR) and (1R,2R,3S,9aS) trihydroxy quinolizidine alkaloids 3a and 3b from D-glucose derived nitrone 4 is described. The key transformation involves the 1,3-addn. of allylmagnesium bromide to nitrone 4 that afforded high diastereoselectivity in the presence of TMSOTf. The N-O bond reductive cleavage, N-Cbz protection, ozonolysis, Wittig olefination, lactam formation and reductive amination cascade afforded the target compds. 3a and 3b in good overall yield.
2004
D. D. Dhavale, S. M. Jachak, N. P. Karche, C. Trombini (2004). Synthesis of trihydroxy quinolizidine alkaloids: 1,3-addition reaction of allylmagnesium bromide to a sugar nitrone. TETRAHEDRON, 60, 3009-3016 [10.1016/j.tet.2004.01.085].
D. D. Dhavale; S. M. Jachak; N. P. Karche; C. Trombini
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/8395
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