Stereoselective aziridination of cyclic allylic alcohols using chloramine-T
作者:Susannah C. Coote、Peter O'Brien、Adrian C. Whitwood
DOI:10.1039/b811137e
日期:——
TsNClNa and t-BuSO(2)NClNa, BusNClNa) has been explored. The stereoselectivity of these reactions was highly dependent on the structure of the allylic alcohol and the chloramine salt. Generally, mixtures of cis- and trans-hydroxy aziridines were obtained, in which the major diastereomer was the cis-hydroxy aziridine, whilst complete cis-diastereoselectivity was observed in the aziridination of 1,3-disubstituted
Concise Assembly of the BCD Ring Part of Ginkgolide C via a Novel Cyclization Reaction
作者:Masahiro Toyota、Ayaka Hibi
DOI:10.3987/com-08-s(f)13
日期:——
Efforts to synthesize a 6-oxatricyclo[6.3.0.0(1.5)]undecane ring system are described. A novel Pd(II)-promoted oxidative cyclization of the lactone ester constructs the tricyclic core of ginkgolide C.
New Route to Azaspirocycles via the Organolithium-Mediated Conversion of β-Alkoxy Aziridines into Cyclopentenyl Amines
作者:Stephen P. Moore、Susannah C. Coote、Peter O'Brien、John Gilday
DOI:10.1021/ol062073e
日期:2006.10.1
A new three-step route to azaspirocycles involving the organolithium-mediated conversion of beta-alkoxy aziridines into substituted cyclopentenyl amines, hydroboration, and cyclization has been developed. The methodology is utilized in the construction of the pentacyclic ring system of cephalotaxine. [reaction: see text]