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.

Synthesis of trihydroxy quinolizidine alkaloids: 1,3-addition reaction of allylmagnesium bromide to a sugar nitrone / D. D. Dhavale; S. M. Jachak; N. P. Karche; C. Trombini. - In: TETRAHEDRON. - ISSN 0040-4020. - STAMPA. - 60:(2004), pp. 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
Synthesis of trihydroxy quinolizidine alkaloids: 1,3-addition reaction of allylmagnesium bromide to a sugar nitrone / D. D. Dhavale; S. M. Jachak; N. P. Karche; C. Trombini. - In: TETRAHEDRON. - ISSN 0040-4020. - STAMPA. - 60:(2004), pp. 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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