Stereoselective synthesis of (Z)-α-haloacrylic acid derivatives, and (Z)-haloallylic alcohols from aldehydes and trihaloesters or amides promoted by Rieke manganese
作者:José M. Concellón、Humberto Rodríguez-Solla、Pamela Díaz
DOI:10.1039/b803449d
日期:——
A Mn*-promoted sequential process directed toward the synthesis of (Z)-α-halo-α,β-unsaturated esters or amides is described. In both cases, the process takes place with complete Z-stereoselectivity. In addition, (Z)-α-chloro-α,β-unsaturated ketones and carboxylic acids, and (Z)-haloallylic alcohols were readily prepared from (Z)-α-halo-α,β-unsaturated amides derived from morpholine, or esters. A mechanism has been proposed to explain the sequential process and the stereoselectivity observed.
描述了一种Mn*-促进的顺序反应过程,旨在合成(Z)-α-卤代-α,β-不饱和酯或酰胺。在这两种情况下,该过程均具有完全的Z立体选择性。此外,从源自吗啉的(Z)-α-卤代-α,β-不饱和酰胺或酯中,能够容易地制备(Z)-α-氯代-α,β-不饱和酮、羧酸和(Z)-卤代烯醇。提出了一种机制来解释观察到的顺序过程和立体选择性。