拜尔-维利格氧化是一种有价值的反应,可以将酮转化为酯或内酯。在这里,我们提出了一种新颖且有效的方法,利用 I 2作为环丁烯酮氧化重排的催化剂,从而合成呋喃-2(5 H )-酮。值得注意的是,该方法采用二甲亚砜 (DMSO) 作为更环保的氧化剂和氧源。在催化量的碘的作用下,反应顺利进行,以良好的产率产生内酯。与依赖过酸或过氧化氢的传统拜尔-维利格氧化反应相比,DMSO 的使用提供了更安全、更通用的替代方案。
two‐carbon (C2) cyclization buildingblock. The present protocol successfully inhibits the competitive cycloaddition with the C≡N bond of acetonitrile, but enables the in situ formation of an unsaturated carbon–carbonbond and the subsequent cycloaddition as a C2 unit. This chemistry features simple reaction conditions, high chemoselectivities, wide substrate scope, and offers a new and practical approach
[4+3]-Cycloaddition Reaction of Sulfilimines with Cyclobutenones: Access to Benzazepinones
作者:Xiaozhou Xie、Jiangtao Sun
DOI:10.1021/acs.orglett.1c03413
日期:2021.11.19
A catalyst-free [4+3]-cycloadditionreaction of N-aryl sulfilimines with cyclobutenones is described, which provides a straightforward protocol for synthesizing 1,5-dihydro-2H-benzo[b]azepin-2-ones under mild reaction conditions. This reaction features a broad substrate scope and good functional group tolerance and does not require catalysts or additives. Moreover, using N-pyridinyl sulfilimine as
描述了N-芳基硫亚胺与环丁烯酮的无催化剂 [4+3] -环加成反应,为在温和反应下合成 1,5-二氢-2 H-苯并 [ b ]azepin-2-ones提供了一个简单的方案状况。该反应具有广泛的底物范围和良好的官能团耐受性,并且不需要催化剂或添加剂。此外,以N-吡啶基硫亚胺为底物,还制备了一系列吡啶并氮杂酮类化合物。
DANHEISER, RICK L.;SAVARIAR, SELVARAJ, TETRAHEDRON LETT., 28,(1987) N 29, 3299-3302