Synthesis of β-Amino Esters by Regioselective Amination of Allyl Bromides with Aryl and Alkyl Amines
作者:Chun-Cheng Lin、Adam Shih-Yuan Lee、Hung-Yang Chen、Laxmikant N. Patkar、Shau-Hua Ueng
DOI:10.1055/s-2005-871934
日期:——
One of the two possible regioisomers can be exclusively formed by combining a suitable solvent and a specific amount of triethylamine as a base during the amination of allyl bromide 5. The SN2′ product 7 was produced using dichloromethane as a solvent and triethylamine (7 equiv) as base; SN2 product 6 was predominantly generated in hexane with 0.5 equivalents of triethylamine. Furthermore, a new reaction condition for the efficient cyclization of 7 to yield α-methylene β-lactam 8 using Sn[N(TMS)2]2 as a reagent, is disclosed.
在烯丙基溴 5 的胺化过程中,通过将合适的溶剂和特定量的三乙胺作为碱混合,可以专门形成两种可能的区域异构体之一。使用二氯甲烷作为溶剂和三乙胺(7 当量)生产 SN2' 产物 7。作为基础; SN2产物6主要在己烷和0.5当量三乙胺中产生。此外,还公开了使用 Sn[N(TMS)2]2 作为试剂,有效环化 7 生成 α-亚甲基 β-内酰胺 8 的新反应条件。