Fluorocyclisation via I(I)/I(III) catalysis: a concise route to fluorinated oxazolines
作者:Felix Scheidt、Christian Thiehoff、Gülay Yilmaz、Stephanie Meyer、Constantin G Daniliuc、Gerald Kehr、Ryan Gilmour
DOI:10.3762/bjoc.14.88
日期:——
Herein, we describe a catalytic fluorooxygenation of readily accessible N-allylcarboxamides via an I(I)/I(III) manifold to generate 2-oxazolines containing a fluoromethyl group. Catalysis is conditional on the oxidation competence of Selectfluor®, whilst HF serves as both a fluoride source and Brønsted acid activator. The C(sp3)-F bond of the mono-fluoromethyl unit and the C(sp3)-O bond of the ring
在本文中,我们描述了经由I(I)/ I(III)歧管容易产生的N-烯丙基羧酰胺的催化氟代氧化反应,以生成含有氟甲基的2-恶唑啉。催化条件取决于Selectfluor®的氧化能力,而HF既可作为氟化物源,又可作为布朗斯台德酸活化剂。单氟甲基单元的C(sp3)-F键与环的C(sp3)-O键成向斜关系排列,从而稳定了与附近的电子富集的σ键(σC- C→σ* CF和σC-H→σ* CO)。通过代表性实例的X射线晶体学分析确定了立体电子薄纱效应的这种表现。鉴于氟在药物研发中的重要性,其调节构象的能力以及2-恶唑啉骨架在自然界中的普遍性,