Copper as a Powerful Catalyst in the Direct Alkynylation of Azoles
作者:François Besselièvre、Sandrine Piguel
DOI:10.1002/anie.200904776
日期:2009.12.7
Copper‐bottomed catalysis! The direct alkynylation of azolesthrough a copper‐based CH bond activation, using alkynylbromides as the coupling partner, has been developed (see scheme). The method is very rapid, is functional‐group tolerant, and provides a straightforward entry to diverse alkynyl heterocycles that is complementary to the Sonogashira reaction.
Intramolecular carbolithiation of <i>N</i>-allyl-ynamides: an efficient entry to 1,4-dihydropyridines and pyridines – application to a formal synthesis of sarizotan
作者:Wafa Gati、Mohamed M Rammah、Mohamed B Rammah、Gwilherm Evano
DOI:10.3762/bjoc.8.250
日期:——
developed a general synthesis of polysubstituted 1,4-dihydropyridines and pyridines based on a highly regioselective lithiation/6-endo-dig intramolecular carbolithiation from readily available N-allyl-ynamides. This reaction, which has been successfully applied to the formalsynthesis of the anti-dyskinesia agent sarizotan, further extends the use of ynamides in organic synthesis and further demonstrates
Gold-catalyzed oxidative cyclization of amide-alkynes: access to functionalized γ-lactams
作者:Yi Zheng、Ting-Ting Zhang、Wen-Bo Shen
DOI:10.1039/d1ob01846a
日期:——
An efficient gold-catalyzedoxidativecyclization of amide-alkynes is developed. A series of functionalized γ-lactams are easily accessed by employing this strategy. The tandem reaction proceeds through alkyne oxidation, carbene/alkyne metathesis, and donor/donor carbene oxidation.
An efficient NaBArF4-catalyzed oxidative cascade cyclization of N-propargyl ynamides has been developed, where NaBArF4 is demonstrated for the first time to be a highly effective catalyst for promoting such an oxidative cyclization. Importantly, this transition metal-free process strongly supports that this oxidative catalysis proceeds by a Lewis acid-catalyzed SN2′ pathway, which is distinct from
已经开发了有效的NaBAr F 4催化的N-炔丙基炔酰胺的氧化级联环化,其中NaBAr F 4首次被证明是促进这种氧化环化的高效催化剂。重要的是,这种无过渡金属的过程有力地支持了这种氧化催化作用是通过路易斯酸催化的S N 2'途径进行的,这不同于相关的氧化金催化作用。通过手性转移策略,该方法可有效,实用地合成具有高非对映选择性和对映选择性的各种有价值的多环N-杂环。
I
<sub>2</sub>
‐Catalyzed Cycloisomerization of Ynamides: Chemoselective and Divergent Access to Indole Derivatives
作者:Bo‐Han Zhu、Sheng‐Bing Ye、Min‐Ling Nie、Zhong‐Yang Xie、Yi‐Bo Wang、Peng‐Cheng Qian、Qing Sun、Long‐Wu Ye、Long Li
DOI:10.1002/anie.202215616
日期:2023.2.13
developed, allowing various bis(indole) derivatives in good to excellent yields with wide substrate scope, which not only represents the first molecular iodine-catalyzed tandem complex alkyne cycloisomerizations but also constitutes the first chemoselective cycloisomerization of tryptamine-ynamides involving distinctively different C−C (alkyl) bond cleavage and rearrangement.