A novel Selectfluor-mediated copper-catalyzed highly selective benzylic C–O cyclization for the synthesis 4H-3,1-benzoxazines is reported. The predominant selectivity for a benzylic C(sp3)–H over an aromatic C(sp2)–H bond in N-o-tolylbenzamides is achieved.
报道了一种新颖的Selectfluor介导的铜催化的高选择性苄基C–O环化反应,用于合成4 H -3,1-苯并恶嗪。在N - o-甲苯基苯甲酰胺中,相对于芳族C(sp 2)-H键,苄基C(sp 3)-H具有主要的选择性。
An Annulative Synthetic Strategy for Building Triphenylene Frameworks by Multiple C−H Bond Activations
作者:Bijoy P. Mathew、Hyun Ji Yang、Joohee Kim、Jae Bin Lee、Yun-Tae Kim、Sungmin Lee、Chang Young Lee、Wonyoung Choe、Kyungjae Myung、Jang-Ung Park、Sung You Hong
DOI:10.1002/anie.201700405
日期:2017.4.24
C−H activation is a versatile tool for appending aryl groups to aromatic systems. However, heavy demands on multiple catalytic cycle operations and site‐selectivity have limited its use for graphene segment synthesis. A Pd‐catal‐ yzed one‐step synthesis of functionalized triphenylene frameworks is disclosed, which proceeds by 2‐ or 4‐fold C−H arylation of unactivated benzene derivatives. A Pd2(dibenzylideneacetone)3
A Modular Flow Design for the<i>meta</i>-Selective C−H Arylation of Anilines
作者:Hannes P. L. Gemoets、Gabriele Laudadio、Kirsten Verstraete、Volker Hessel、Timothy Noël
DOI:10.1002/anie.201703369
日期:2017.6.12
effective and practical modularflowdesign for the meta-selective C-Harylation of anilines. The design consists of four continuous-flow modules (i.e., diaryliodonium salt synthesis, meta-selective C-Harylation, inline copper extraction, and aniline deprotection) which can be operated either individually or consecutively to provide direct access to meta-arylated anilines. With a total residence time
Studying competitive lithiations at alpha-, ortho-, and benzylic positions in various N-protected aniline derivatives
作者:Martin Schmid、Birgit Waldner、Michael Schnürch、Marko D. Mihovilovic、Peter Stanetty
DOI:10.1016/j.tet.2011.02.056
日期:2011.4
The directing effects of the t-BuOCONH– (NHBoc) and the t-BuCONH– (NH–pivaloyl) groups have been investigated on a series of differently substituted anilines. Depending on the nature of the directing group and the substrate, lithiation either occurred in the ortho-, benzylic-, or alpha-position. In general, it was observed that ortho-lithiation is the least facile process and alpha-lithiation slightly