Synthesis applications of aza-Cope rearrangements. Stereoselective synthesis of cis-3a-aryloctahydroindoles and a new short entry to Amaryllidaceae alkaloids
Total Synthesis of (?)-Crinine. Use of Tandem Cationic Aza-Cope Rearrangement/Mannich Cyclizations for the Synthesis of Enantiomerically PureAmaryllidaceae Alkaloids
作者:Larry E. Overman、Soji Sugai
DOI:10.1002/hlca.19850680324
日期:1985.5.15
The totalsynthesis of enantiomerically pure (−)-crinine (1) in 10 steps and 6% overall yield from cyclopentene oxide is reported. The key step was the rearrangement of 7 upon reaction with AgNO3 at 25°C to give cis-perhydroindolone 8 in 81% yield.
The cyanomethyl group for nitrogen protection and iminium ion generation in ring-enlarging pyrrolidine annulations. A short synthesis of the amaryllidaceae alkaloid d,1-crinine
作者:Larry E Overman、E.Jon Jacobsen
DOI:10.1016/s0040-4039(00)87446-8
日期:——
Ring-Enlarging Cyclohexane Annulations
作者:Sumie Ando、Keith P. Minor、Larry E. Overman
DOI:10.1021/jo970399i
日期:1997.9.1
A Prins-pinacol rearrangement is the key step in a new method for synthesizing cis-bicyclo[n.4.0]alkanones. The alkenyl acetal rearrangement substrates 1 are assembled from cycloalkanone precursors in four steps (Table 1). Prins-pinacol rearrangement to form cis-bicyclo[n.4.0]alkanones 3 is best accomplished by exposure of 1 to 1 equiv of TMSOTf and a proton scavenger (2,6-di-tert-butyl-4-methylpyridine) at -78 degrees C --> rt.