Chiral Lithium(I) Binaphtholate Salts for the Enantioselective Direct Mannich-Type Reaction with a Change of Syn/Anti and Absolute Stereochemistry
作者:Manabu Hatano、Takahiro Horibe、Kazuaki Ishihara
DOI:10.1021/ja909874b
日期:2010.1.13
and enantioselective direct Mannich-type reaction of aldimines with 1,3-dicarbonyl compounds using Li(I) BINOLate salts as effective Lewis acid-Brønsted base catalysts has been developed. Li(I) BINOLate salts offered high catalytic activity toward 1,3-dicarbonyl compounds such as diketone, ketoester, ketothioester, ketoamide, and ketolactone. The reactions proceeded at -78 degrees C within 1-2 h in
已经开发了一种高度非对映选择性和对映选择性直接曼尼希型醛亚胺与 1,3-二羰基化合物的反应,使用 Li(I) BINOlate 盐作为有效的路易斯酸-布朗斯台德碱催化剂。Li(I) BINOLate 盐对 1,3-二羰基化合物(如二酮、酮酯、酮硫酯、酮酰胺和酮内酯)具有高催化活性。反应在 1-2 小时内在 -78 摄氏度进行,在 1-10 mol % 催化剂的存在下,表现出与其他以前的催化剂完全不同的催化活性(周转频率 = 284 h(-1))。反产物是从无环酮酯中选择性获得的,没有在 α-叔碳中心进行差向异构化,这些是有价值的,因为以前的催化剂通常会产生顺/反混合物,或者立体化学尚未确定。