RuCl3 catalyses aldol condensations of aldehydes and ketones
作者:Nasser Iranpoor、Foad Kazemi
DOI:10.1016/s0040-4020(98)00575-4
日期:1998.8
Anhydrous RuCl3 catalyses the efficient cross aldolcondensations of different ketones with various aromaticaldehydes in sealed tube under solvent free conditions without the occurrence of any self condensations. Regioselective self condensation reaction of some ketones and aldehydes are also described. The catalytic effect of Ru(III) is shown by performing similar reactions under thermal conditions
Chiral enamides, easily prepared in one step from a cyclic ketone and an oxazolidinone, are successfully employed in high-yielding, endo, and facially selective Hetero-Diels−Alderreactions involving activated oxadienes and Siever’s reagent as catalyst. From the resulting bicyclic heteroadducts, a novel and efficient asymmetric modification for the Robinson annulation of cyclic monoketones is described
Disclosed is a direct acid catalyzed intermolecular electrocyclic rearrangement process for the preparation of linear and cyclic homoallylic ester and amides.
本发明揭示了一种直接酸催化的分子间电环重排过程,用于制备线性和环状同烯基酯和酰胺。
PROCESS FOR PREPARING CYCLIC KETONES
申请人:Teles Joaquim Henrique
公开号:US20110152576A1
公开(公告)日:2011-06-23
The present invention relates to a process for preparing at least one monocyclic ketone having from 4 to 20 carbon atoms by reacting a mixture G
1
comprising at least one monocyclic olefin having from 4 to 20 carbon atoms with a mixture G
2
comprising at least dinitrogen monoxide, wherein said reaction is performed adiabatically.
作者:Asunción Barbero、Pilar Castreño、Francisco J. Pulido
DOI:10.1021/ja051967b
日期:2005.6.1
A novel highly stereoselective spiro-cyclopropanation reaction from oxoallylsilanes is described. Oxoallylsilanes are readily obtained by silylcupration of allene followed by conjugate addition to enones. The former oxoallylsilanes undergo a tandem cyclization-cyclopropanation reaction when treated with CH2I2/Me3Al, leading to hydroxylated polycyclic systems bearing the spiro-cyclopropane moiety. The scope of the process is studied, and a feasible pathway is discussed.