Practical and Broadly Applicable Catalytic Enantioselective Additions of Allyl-B(pin) Compounds to Ketones and α-Ketoesters
作者:Daniel W. Robbins、KyungA Lee、Daniel L. Silverio、Alexey Volkov、Sebastian Torker、Amir H. Hoveyda
DOI:10.1002/anie.201603894
日期:2016.8.8
catalytic additions of easy‐to‐handle allyl‐B(pin) (pin=pinacolato) compounds to ketones and acyclic α‐ketoesters was developed. Accordingly, a large array of tertiary alcohols can be obtained in 60 to >98 % yield and up to 99:1 enantiomeric ratio. At the heart of this development is rational alteration of the structures of the small‐molecule aminophenol‐based catalysts. Notably, with ketones, increasing
开发了一套广泛适用的方法,用于将易于处理的烯丙基-B(pin)(pin = pinacolato)化合物有效催化加成到酮和无环α-酮酸酯中。因此,可以以60至> 98%的产率和高达99:1的对映体比例获得各种各样的叔醇。这一发展的核心是合理改变小分子氨基酚基催化剂的结构。明显地,对于酮,增加催化剂部分的尺寸(tBu至SiPh 3)导致更高的对映选择性。另一方面,对于α-酮酸酯,不仅如此,因为Me取代会导致对映选择性大大提高,而且选择性的意义也相反。