Arylation and Aryne Insertion into C-Acylimines: A Simple, Flexible, and Divergent Synthesis of C2-Aryl Indoles
作者:Srinivasarao Yaragorla、Doma Arun
DOI:10.1021/acs.joc.2c01753
日期:2022.11.4
indoles without transition metal catalysts. The synthesis involves a one-pot, four-component reaction of readily available starting materials to offer diversity around the indole moiety with a broad substrate scope and high yields. The reaction proceeds via the Friedel–Crafts C-arylation of C-acylimine formed in situ, followed by N-arylation with aryne, a formal [3+2] cycloaddition, and a subsequent aromatization
one-pot, four-component strategy for the synthesis of trifluoromethylated, and other fully-substituted pyrroles is reported using minimum loading of calcium catalyst at room temperature. A variety of arenes, α-keto aldehydes, amines, and activatedalkynes took part in the reaction to produce high-yielding products. Friedel–Crafts arylation and aza-Michael addition are the key reactions in this approach.
Oxidative Cleavage of C<sub>sp<sup>3</sup></sub>–C<sub>sp<sup>2</sup></sub> and C<sub>sp<sup>3</sup></sub>–H Bonds with KO<sup><i>t</i></sup>Bu: Highly Robust and Practical Synthesis of Diaryl/(het-Ar) Ketones
作者:Srinivasarao Yaragorla、Tabassum Khan、Ahalya Behera
DOI:10.1021/acs.joc.2c02519
日期:2023.2.17
report an efficient and practical approach for synthesizing diaryl(het) ketones from R–CO–CHR–Ar through a simultaneous oxidativecleavage of C–C and C–H bonds using KOtBu. This method enables synthesizing a variety of unsymmetrical and symmetrical (hetero)aryl ketones in excellent yields, which are otherwise difficult to make. Besides, we synthesized natural products using this method.
在此,我们报告了一种通过使用 KO t Bu 同时氧化裂解 C-C 和 C-H 键从 R-CO-CHR-Ar 合成二芳基(杂)酮的有效且实用的方法。这种方法能够以优异的收率合成各种不对称和对称(杂)芳基酮,否则很难制备。此外,我们用这种方法合成了天然产物。
Calcium-Catalyzed Synthesis of Fused Furo[2,3-<i>b</i>]furans and Substituted Furans from 2-Oxo Aldehydes and Cyclic Enols
an atom-economical, syn-diastereoselective synthesis of naphtho-fused furo[2,3-b]furans along with naphthofurans at room temperature using readily available 2-naphthols and 2-oxo aldehydes using an alkaline earth catalyst [Ca(OTf)2]. 2-Oxo aldehydes having both aryl and alkyl substitutions reacted well. A good number of arenols responded to give fused furans, but selected arenols gave only furofurans
我们在这里报道了一种原子经济的顺式非对映选择性合成萘并稠合呋喃[2,3- b ]呋喃以及萘并呋喃在室温下使用容易获得的2-萘酚和2-氧代醛使用碱土金属催化剂[Ca( OTf) 2 ]。具有芳基和烷基取代的2-氧代醛反应良好。许多芳醇响应产生稠合呋喃,但选定的芳醇仅产生呋喃呋喃。合成应用和克级合成也被证明可以加强这一策略。
C(sp<sup>2</sup>)‐H Imination of Imidazo[1,2‐<i>a</i>]pyridines: A Catalyst‐Free, Multicomponent Approach
We have developed a one-pot, three-component strategy for the Friedel-Crafts arylation of α-imino ketones with imidazopyridines under catalyst-free conditions. The reaction did not require any inert conditions and proceeded at room temperature in the open flask.