Novel Diamino and Diimino Thioethers – Chiral Tridentate Ligands for Asymmetric Michael Reactions?
作者:Jens Christoffers、Alexander Mann
DOI:10.1002/(sici)1099-0690(199906)1999:6<1475::aid-ejoc1475>3.0.co;2-r
日期:1999.6
β,β′-diamino thioethers 1 and β,β′-diimino thioethers 2 have been prepared from chiral α-amino acids. Nine of these compounds have been screened as ligands, in combination with 13 metal salts, with a view to achieving the enantioselective catalysis of a Michael reaction of a β-oxo ester with methyl vinyl ketone resulting in an optimal ee of 17%.
已从手性 α-氨基酸制备了新型 C2 对称对映体纯 β,β'-二氨基硫醚 1 和 β,β'-二亚氨基硫醚 2。这些化合物中的 9 种已被筛选为配体,与 13 种金属盐结合,以实现对 β-氧代酯与甲基乙烯基酮的迈克尔反应的对映选择性催化,产生 17% 的最佳 ee。