Silicon-DirectedNazarov Reactions III. Stereochemical and Mechanistic Considerations
作者:Todd K. Jones、Scott E. Denmark
DOI:10.1002/hlca.19830660803
日期:1983.12.14
senses of electrocyclization are responsible for the observed products. Additional experiments suggest that steric, rather than stereoelectronic forces control the sense of cyclization. A qualitative description of the nature of reactive intermediates in the silicon-directedNazarov reaction is proposed as well as an explanation for the remarkable efficacy of FeCl3 for inducing the reaction.
JONES, T. K.;DENMARK, S. E., HELV. CHIM. ACTA, 1983, 66, N 8, 2377-2396
作者:JONES, T. K.、DENMARK, S. E.
DOI:——
日期:——
Silicon-DirectedNazarov Reactions II. Preparation and Cyclization of ?-Silyl-substituted Divinyl Ketones
作者:Todd K. Jones、Scott E. Denmark
DOI:10.1002/hlca.19830660802
日期:1983.12.14
Two general methods for the preparation of β-silyl-substituted divinyl ketones have been developed starting from either α, β-unsaturated aldehydes or simple ketones. Anhydrous FeCl3 induces the cyclization to cyclopentenones under mild conditions and in good yields with predictable and complete control over the position of the double bond in the five-membered ring. The observed effects of substituents