Palladium-catalyzed asymmetric allylic nucleophilic substitution reactions using chiral tert-butanesulfinylphosphine ligands
作者:Junmin Chen、Feng Lang、Dong Li、Linfeng Cun、Jin Zhu、Jingen Deng、Jian Liao
DOI:10.1016/j.tetasy.2009.07.041
日期:2009.9
The asymmetric allylic alkylation of racemic 1,3-diphenyl-2-propenyl acetate 3 with dimethyl malonate proceeded smoothly in the presence of lithium acetate, BSA (N,O-bis(trimethylsilyl)acetamide), [Pd(η3-C3H5)Cl]2, and chiral tert-butanesulfinylphosphine ligand 2c to give the allylic alkylation product in good yield and high enantiomeric excess (up to 93% ee), while the enantioselectivities of allylic
外消旋的非对称烯丙基烷基化1,3-二苯基-2-丙烯基乙酸酯3与丙二酸二甲酯在乙酸,BSA(锂的存在下顺利进行Ñ,ö双(三甲基硅烷基)乙酰胺),[将Pd(η 3 -C 3 H 5)Cl] 2和手性叔丁烷亚磺酰基膦配体2c,可得到高收率和高对映体过量(最高93%ee)的烯丙基烷基化产物,而3与各种胺的烯丙基胺化的对映选择性适中(最高到76%ee)。