Studies Towards Asymmetric Catalyzed Metallo-ene Reactions
作者:Wolfgang Oppolzer、David L Kuo、Michael W Hutzinger、Roger Léger、Jean-O Durand、Colin Leslie
DOI:10.1016/s0040-4039(97)01417-2
日期:1997.9
The asymmetric catalyzed metallo-ene reaction was studied. Enantioselectivities up to 47% were observed using the Pd-ene reaction applied on the substrate 4. (C) 1997 Elsevier Science Ltd.
Octadienyl carbonates 5 provide cyclic 1,4-dienes 6 when treated with Rh1 complexes (1–10 mol-%) at 80°. Similar cyclization of cyclohexenyl acetate 8 affords cis- fused hexahydroindene 9. Analogous ring closures of nonadienyl carbonate 10 yield preferably the cis-divinypyrrolidine 11 with Rh1 catalysis but the trans-isomer 12 when catalyzed by Pd0. Azaoctadienyl carbonate 5a undergoes elimination