functionalized N-amino-3-nitrile-indole derivatives are obtained via an intramolecular hetero-cyclization of 2-aryl-3-substituted hydrazono-alkylnitriles using FeBr3 as a single electron oxidant. This approach allows the N-moiety on the side-chain to be annulated to the benzene ring during the final synthetic step via direct oxidative aromatic C–N bond formation.
Synthesis of 2<i>H</i>-Azirines via Iodine-Mediated Oxidative Cyclization of Enamines
作者:Manman Wang、Jiao Hou、Wenquan Yu、Junbiao Chang
DOI:10.1021/acs.joc.8b02022
日期:2018.12.21
practical oxidativecyclization reaction of enamines to 2H-azirines has been developed, employing molecular iodine. The features of the present synthetic approach include no use of transition metals, mild reaction conditions, and simplicity of operation. Under the optimal reaction conditions, a variety of 2H-azirine derivatives were synthesized from simple and readily accessible enamine precursors
An Expeditious Synthesis of 6-Alkyl-5-(4′-amino-phenyl)-pyrimidine-2,4-diamines
作者:Daniel D. Holsworth、Michael Stier Jeremy、J. Edmunds、Wei He、Samuel Place、Samarendra Maiti
DOI:10.1081/scc-120024725
日期:2003.10
Abstract A rapid synthesis of a series of 6-alkyl substituted-5-(4′-amino-phenyl)-pyrimidine-2,4-diamines is described. These analogs were produced in good yields on moderate scale (ca. 8 g) without chromatography. Furthermore, the methodology described herein allows the production of 6-[ethyl, propyl, isopropyl, and isobutyl]-5-(4′-amino-phenyl)-pyrimidine-2,4-diamines in a more straightforward manner
Rhodium‐Catalyzed Asymmetric Hydrogenation of Tetrasubstituted α,β‐Unsaturated Amides: Efficient Access to Chiral β‐Amino Amides†
作者:Bing Jiao、Fangyuan Wang、Hui Lv
DOI:10.1002/cjoc.202400344
日期:2024.11
The first asymmetrichydrogenation of acyclic tetrasubstituted α,β-unsaturated amides has been achieved by usingRh/DuanPhos complex as a catalyst, delivering chiral β-amino amides with two contiguous chiral centers in excellent yields and high enantioselectivities (up to 99% yield, 96% ee), which provides efficient and concise access to valuable β-amino amide derivatives. The gram-scale reaction and