Reported herein is the hydride transfer initiated redox-neutral cascadecyclizations of aurones, providing a variety of [6,5] spiro-heterocycles in satisfactory yields and good diastereoselectivities.
The controllable synthesis of spirooxindole–dihydrofurans and spirooxindole–benzazepines was developed through formal [3 + 2] and [5 + 2] cyclization reactions from 2-(2-oxoindolin-3-yl)malononitriles and ortho-aminobenzaldehydes, respectively. A variety of spirooxindole-benzazepines were facilely constructed via a furan ring-open-involved hydride transfer/cyclization process. It is noteworthy that
Scope and Limitations of the T-Reaction Employing Some Functionalized C-H-Acids and Naturally Occurring Secondary Amines
作者:Constantin Rabong、Christian Hametner、Kurt Mereiter、Victor G. Kartsev、Ulrich Jordis
DOI:10.3987/com-07-11260
日期:——
Scope and limitations of the T-reaction with emphasis on using chiral, natural products as starting materials to prepare novel chiral heterocycles is studied and the diastereoselective introduction of newly formed stereocenters is explained via proposed mechanisms.
研究了 T 反应的范围和局限性,重点是使用手性天然产物作为起始材料制备新型手性杂环,并通过提出的机制解释了新形成的立体中心的非对映选择性引入。
Expedient Synthesis of 1,4‐Benzodiazepines via a Tandem Condensation/[1,5]‐Hydride Transfer/Cyclization Process
作者:Siyuan Liu、Tuan Zhao、Jingping Qu、Baomin Wang
DOI:10.1002/adsc.201800781
日期:2018.11.5
An expedient approach to 1,4‐benzodiazepines via a tandem condensation/[1,5]‐hydride shift/cyclization process has been developed. This transformation started from readily available o‐amino benzaldehyde and aminomalonate and was promoted by low‐cost FeCl3 with high step and atom economy.