We have demonstrated the feasibility of the kinetic resolution of atropisomeric amides using the commercially avaliable AD-mix. To our knowledge, this methodology represents the first catalytic kinetic resolution of such compounds. Relative rates of up to 32 have been found for the kinetic resolution processes. We have also determined the barriers to rotation and half-lives of some of these amides. The half-lives range from 7 to 135 h at room temperature.
We have demonstrated the feasibility of the kinetic resolution of atropisomeric amides using the commercially avaliable AD-mix. To our knowledge, this methodology represents the first catalytic kinetic resolution of such compounds. Relative rates of up to 32 have been found for the kinetic resolution processes. We have also determined the barriers to rotation and half-lives of some of these amides. The half-lives range from 7 to 135 h at room temperature.
Rapid, highly diastereoselective addition of dialkylzinc reagents to atropisomeric 2-formyl arylamides
作者:Ciril Jimeno、Ramon Rios、Patrick J. Carroll、Patrick J. Walsh
DOI:10.1016/j.tet.2003.12.071
日期:2004.5
dialkylzinc reagents add to atropisomeric 2-formyl arylamides many times faster than they react with other substituted benzaldehyde derivatives. Additionally, with diethylzinc the products were formed with very high diastereoselectivity, affording the syn product (d.r. greater than 95:5), except in one case where epimerization of the product is rapid. In contrast, Grignard and trialkylaluminum reagents afforded
Dynamic Kinetic Resolution of Atropisomeric Amides
作者:Vincent Chan、Jeung Gon Kim、Ciril Jimeno、Patrick J. Carroll、Patrick J. Walsh
DOI:10.1021/ol0492952
日期:2004.6.1
Using L-proline as catalyst in the asymmetric aldol reaction and a series of benzamides and naphthamides, we have accomplished a dynamic kinetic resolution that simultaneously establishes the stereochemistry of the atropisomeric amide's chiral axis and a stereogenic center. The enantioselectivities ranged from 82% to 95% and the diastereoselectivities from 2.1:1 to 7.01.
Kinetic Resolution of Atropisomeric Amides
作者:Ramon Rios、Ciril Jimeno、Patrick J. Carroll、Patrick J. Walsh
DOI:10.1021/ja026436r
日期:2002.9.1
We have demonstrated the feasibility of the kinetic resolution of atropisomeric amides using the commercially avaliable AD-mix. To our knowledge, this methodology represents the first catalytic kinetic resolution of such compounds. Relative rates of up to 32 have been found for the kinetic resolution processes. We have also determined the barriers to rotation and half-lives of some of these amides. The half-lives range from 7 to 135 h at room temperature.