Tetrahedron p. 2957 - 2968 (1991)
Update date:2022-08-04
Topics:
Nakano, Tatsuhiko
Martin, Alfonso
Alonso, Miguel
The synthesis of cycloprotobuxine-A (5), representative of Buxus alkaloids, and its two isomeric alkaloids with 3β,20R- and 3α,20R-configuration, from lanosterol, is described.In order to confirm the stereochemistries at C-3 and C-20 in these three alkaloids, the 3β-dimethylamino-(27) and the 3α-dimethylamino derivative (28) of cycloartanol (24) were also synthesised and their 1H and 13C n.m.r.spectra are discussed.
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