Catalytic (3 + 2) annulation of donor–acceptor aminocyclopropane monoesters and indoles
作者:Vincent Pirenne、Emma G. L. Robert、Jerome Waser
DOI:10.1039/d1sc01127h
日期:——
The efficient catalytic activation of donor–acceptor aminocyclopropanes lacking the commonly used diester acceptor is reported here in a (3 + 2) dearomative annulation with indoles. Bench-stable tosyl-protected aminocyclopropyl esters were converted into cycloadducts in 46–95% yields and up to 95 : 5 diastereomeric ratio using catalytic amounts of triethylsilyl triflimide. Tricyclic indoline frameworks
Manganese(III) Acetate Catalyzed Aerobic Dehydrogenation of Tertiary Indolines, Tetrahydroquinolines and an
<i>N</i>
‐Unsubstituted Indoline
作者:Xiaokang Niu、Lei Yang
DOI:10.1002/adsc.202100581
日期:2021.9.7
A Mn(OAc)3 ⋅ 2H2O-catalyzed aerobic dehydrogenation of five and six-membered N-heterocycles for the synthesis of N-heteroarenes is reported. Of note, this protocol can be applied to the dehydrogenation of tertiary indolines with various electron-deficient N-substituents. Preliminary mechanistic investigations support that a single-electron transfer pathway might be involved.
报道了Mn(OAc) 3 ⋅ 2H 2 O 催化的五元和六元N-杂环有氧脱氢反应,用于合成N-杂芳烃。值得注意的是, 该协议可应用于具有各种缺电子N取代基的叔二氢吲哚的脱氢。初步机理研究支持可能涉及单电子转移途径。
Donor‐Acceptor Aminocyclobutane Monoesters: Synthesis and Silylium‐Catalyzed (4+2) Annulation with Indoles
作者:Emma G. L. Robert、Vincent Pirenne、Matthew D. Wodrich、Jérôme Waser
DOI:10.1002/anie.202302420
日期:2023.6.26
Aminocyclobutanes are high potential building blocks but have been underexplored. A one-step synthesis to access them from commercial starting materials was developed. Using these new donor-acceptor systems, a (4+2) annulation was conducted with indoles using silylium catalysis. When performed intramolecularly, the tetracyclic structure of either akuamma or malagasy alkaloids was obtained selectively