employed to investigate asymmetric Nicholas reactions. We found that the use of a chiral N-enoyl derivative provided acceptable levels of selectivity for an intermolecular Nicholas reaction, however, we were unable to identify an auxiliary that could be utilized in an asymmetric conjugate addition and a tandem inter/intramolecular series of Nicholas reactions. The use of chiral pool non-racemic propargyl
The present invention provides compounds useful for increasing cellular ATP binding cassette transporter ABCA1 production in mammals, and to methods of using such compounds in the treatment of coronary artery diseases, dyslipidiemias and metabolic syndrome. The invention also relates to methods for the preparation of such compounds, and to pharmaceutical compositions containing them.
Enantioselective Alkynylation Reactions to Substituted Benzaldehyde and Salicylaldehyde Derivatives: The Effect of Substituents upon the Efficiency and Enantioselectivity
Asymmetric alkynylation reactions to mono-, di-, and trisubstituted aromatic aldehydes have been accomplished in good yields and with a range of selectivities. For salicylaldehyde derivatives both the yield and the enantioselectivity of the alkynylation reaction appears to depend not only upon the electron-donating/ electron-withdrawing nature of substituents but also upon their position in the ring
First Examples of Proline-Catalyzed Domino Knoevenagel/Hetero-Diels-Alder/Elimination Reactions
作者:Gowravaram Sabitha、Narjis Fatima、E. Venkata Reddy、J. S. Yadav
DOI:10.1002/adsc.200505144
日期:2005.8
A novel and efficient one-pot synthesis of lactones (pyranones) has been achieved by domino Knoevenagel/hetero-Diels–Alder/elimination reactions of O- and N-prenyl aldehyde derivatives with Meldrum's acid in the presence of L- or D,L-proline. The reaction proceeds cleanly at room temperature to afford cis- or trans-fused products in good yields with high diastereoselectivity.
The present invention provides compounds useful for increasing cellular ATP binding cassette transporter ABCA1 production in mammals, and to methods of using such compounds in the treatment of coronary artery diseases, dyslipidiemias and metabolic syndrome. The invention also relates to methods for the preparation of such compounds, and to pharmaceutical compositions containing them.