Exploiting the Divergent Reactivity of α-Isocyanoacetate: Multicomponent Synthesis of 5-Alkoxyoxazoles and Related Heterocycles
作者:Claudia Lalli、Marinus J. Bouma、Damien Bonne、Géraldine Masson、Jieping Zhu
DOI:10.1002/chem.201002098
日期:2011.1.17
A novel multicomponent synthesis of 5‐alkoxyoxazoles, based on a new reactivity profile of α‐isocyanoacetates, is described. Thus, simply heating a solution of amine, aldehyde, and α‐(EWG‐phenyl)‐α‐isocyanoacetate or α‐(4‐pyridyl)‐α‐isocyanoacetate (EWG=electron‐withdrawing group) in toluene provided 5‐alkoxyoxazoles in good to excellent yields. Reaction of the 5‐alkoxyoxazoles with various α,β‐unsaturated
基于α-异氰基乙酸酯的新反应谱,描述了一种新型的5-烷氧基恶唑的多组分合成方法。因此,只需加热胺,醛和α-(EWG-苯基)-α-异氰基乙酸盐或α-(4-吡啶基)-α-异氰基乙酸盐(EWG =吸电子基团)在甲苯中的溶液,即可得到5-烷氧基恶唑好到极好的产量。5-烷氧基恶唑与各种α,β-不饱和酰氯的反应导致多米诺N-酰化/ Diels-Alder环加成反应形成环氧四氢吡咯并[3,4-b]吡啶-5-。随后在基本条件下的裂解提供了6,7-二氢-5 H-吡咯并[3,4-b]吡啶-5-5。随后开发了吡啶-5-酮化合物的四组分合成方法,但未分离出5-烷氧基恶唑。