The products of an imino Diels–Alder reaction with 2-trimethylsilyloxycyclohexadiene: synthesis, X-ray crystal structures, and mechanistic implications
作者:Timothy N. Birkinshaw、Alethea B. Tabor、Andrew B. Holmes、Perry Kaye、Peter M. Mayne、Paul R. Raithby
DOI:10.1039/c39880001599
日期:——
The reaction of the N-tosyl imino-ester (1) with 2-trimethylsilyloxycyclohexadiene (2) followed by acidic work-up shows a divergence in pathways: at low temperature in polar solvents the cyclohexenones (5) and (6)(X-ray) are favoured, whereas at higher temperatures the bicyclic ketones (3) and (4)(X-ray) are the predominant products.
Imino Diels–Alder reaction of 2-t-butyldimethylsilyloxycyclohexadiene: isolation of an azabicyclo[2.2.2]octene silyl enol ether adduct
作者:Timothy N. Birkinshaw、Alethea B. Tabor、Andrew B. Holmes、Paul R. Raithby
DOI:10.1039/c39880001601
日期:——
The iminoDiels–Alderreaction of (1) with 2-t-butyldimethylsilyloxycyclohexadiene (2) gave after acidic work-up mainly the bicyclic enolethers (5a)(for which a novel X-ray crystal structure determination is reported) and (5b) together with small amounts of bicyclic ketones (3a,b) and cyclohexenones (4a,b).
Total synthesis of (±)-isoprosopinine B and (±)-desoxoprosopinine
作者:Andrew B. Holmes、John Thompson、Andrew J. G. Baxter、John Dixon
DOI:10.1039/c39850000037
日期:——
The synthesis of the title compounds (10) and (16) in eleven and ten steps respectively from the imine (1) and 2-trimethylsilyloxycyclohexa-1,3-diene (2)via the azabicyclo-octanone (3) and the triol (5) illustrates a new general method for the preparation of the prosopis alkaloids.