通过简单有效的方法,实现了由辛可宁衍生的生物碱β-异cupreidine催化的N -2,2,2-三氟乙基异丁酮酮与MBH型碳酸盐之间的不对称S N 2'–S N 2'反应。制备了一系列具有优异收率和立体选择性的手性α-三氟甲基胺。随后且容易的脱保护过程以立体选择性的方式得到了γ-三氟甲基-α-亚甲基内酰胺。
Catalyst‐Controlled Regiodivergent Synthesis of α/β‐Dipeptide Derivatives via
<i>N</i>
‐Allylic Alkylation of
<i>O‐</i>
Alkyl Hydroxamates with MBH Carbonates
A catalyst-controlled switchable N-allylic reaction of O-alkyl hydroxamates with MBH carbonates is reported, providing a regiodivergent method for α/β-dipeptides derivatives.
The highly stereoselective allylicalkylation of Morita–Baylis–Hillman carbonates with β-ketoesters catalysed by β-ICD is described. The corresponding products containing two adjacent quaternary and tertiary carbon centers were obtained in good yields with high diastereoselectivity (up to 10 : 1 dr) and enantioselectivity (up to 95% ee).
Lewis base-catalyzed cyanation of Morita-Baylis-Hillman carbonates. Synthesis of allylamine derivatives
作者:Hai Ma、Feng Sui、Qing-He Zhao、Ning Zhang、Yi Sun、Jing Xian、Meng-Jiao Jiao、Yu-ling Liu、Zhi-Min Wang
DOI:10.1016/j.tetlet.2017.07.038
日期:2017.8
DABCO-catalyzed cyanation of MBH carbonates via 1,3-proton shift transfer is reported. The adducts of cyanation are converted in one step to allylic amines derivatives. The salient features of this reaction include readily available starting materials, mild conditions, broad substrate scope, high efficiency and valuable further applications. The process of the 1,3-proton shift transfer was conducted
Acylation of Baylis-Hillman carbonates by visible light catalysis has been reported. Acyl radical is produced by decarboxylation of α-keto acid. This method has mild conditions, wide substrate scope, good functional group tolerance, and moderate to good yield, which provides a new route for the acylation of Baylis-Hillman derivatives.
A highly efficient organocatalytic enantioselective CS bond formation reaction between simple alkyl thiols and Morita–Baylis–Hillman (MBH) carbonates is described. The optically active α-methylene β-mercapto esters could be obtained under mild reaction conditions with excellent enantioselectivities (up to 97% ee). The broad scope and simple operation make this methodology very practical.