diverse five‐membered lactams from aliphaticamides and terminal acetylenes with the assistance of an 8‐aminoquinolyl auxiliary has been achieved. A broad range of terminal acetylenes and aliphaticamides proved to be the efficient coupling partners, furnishing the corresponding lactams in moderate to good yields. The transformation is proven to undergo an oxidative alkynylation followed by the intramolecular
Silica-Supported Cationic Gold(I) Complexes as Heterogeneous Catalysts for Regio- and Enantioselective Lactonization Reactions
作者:Xing-Zhong Shu、Son C. Nguyen、Ying He、Fadekemi Oba、Qiao Zhang、Christian Canlas、Gabor A. Somorjai、A. Paul Alivisatos、F. Dean Toste
DOI:10.1021/jacs.5b04294
日期:2015.6.10
catalysts has been developed. These catalysts were easily assembled from readily available silica materials and gold complexes. The heterogeneous catalysts exhibited superior reactivity in various reactions where protodeauration is the rate-limiting step. Dramatic enhancement in regio- and enantioselectivity was observed when compared to the homogeneous unsupported gold catalyst. The catalysts are easily
<scp>Copper‐Catalyzed</scp>
Modular Access to
<scp>
<i>N</i>
‐Fused
</scp>
Polycyclic Indoles and
<scp>5‐Aroyl</scp>
‐pyrrol‐2‐ones
<i>via</i>
Intramolecular N—H/C—H Annulation with Alkynes: Scope and Mechanism Probes
作者:Yan‐Hua Liu、Hong Song、Chi Zhang、Yue‐Jin Liu、Bing‐Feng Shi
DOI:10.1002/cjoc.202000246
日期:2020.12
Copper‐catalyzed intramolecular N—H/C—H annulation with alkynes has been developed. A variety of densely functionalized heterocycles, such as pyrrolo[1,2‐a]indoles, indolo[1,2‐c]quinazolin‐2‐ones, oxazolo[3,4‐a]indoles, and imidazo[1,5‐a]indoles, were synthesized in an atom‐ and step‐economical manner, owing to the high modularized feature of aniline moiety, the linker moiety, as well as the alkyne
已经开发了使用炔烃的铜催化分子内NH / CH环合反应。各种稠密官能化的杂环,如吡咯并[1,2- a ]吲哚,吲哚并[1,2 - c ]喹唑啉-2-酮,恶唑并[3,4- a ]吲哚和咪唑[1,5-由于苯胺部分,连接子部分和炔烃部分具有高度模块化的特征,因此以原子和分步经济的方式合成了α ]吲哚。通过简单地改变从二氧化剂叔将过氧化叔丁基(DTBP)转化为2,2,6,6-四甲基哌啶-1-氧基(TEMPO),该反应很容易转化为氨氧化途径,该途径从TEMPO夺取一个氧原子以生成5-芳酰基吡咯2个 机理实验表明,乙烯基自由基参与了该反应,而酰胺基自由基引发的自由基级联反应可能是造成这种转变的原因。
Cobalt-Catalyzed Cyclization of Aliphatic Amides and Terminal Alkynes with Silver-Cocatalyst
A new method of cobalt-catalyzed synthesis of pyrrolidinones from aliphatic amides and terminal alkynes was discovered through a C-Hbond functionalization process on unactivated sp(3) carbons with the silver cocatalyst using a bidentate auxiliary. For the first time, a broad range of easily accessible alkynes are exploited as the reaction partner in C(sp(3))-H bondactivation to give the important
Stoichiometric and Catalytic C−C and C−H Bond Formation with B(C<sub>6</sub>
F<sub>5</sub>
)<sub>3</sub>
via Cationic Intermediates
作者:Yashar Soltani、Lewis C. Wilkins、Rebecca L. Melen
DOI:10.1002/anie.201704789
日期:2017.9.18
concomitant C−H or C−C bondformation. The activation of alkyne‐containing substrates with B(C6F5)3 enabled the first catalytic intramolecular cyclizations of carboxylic acid substrates using this Lewis acid. In addition, intramolecular cyclizations of esters enable C−C bondformation as catalytic B(C6F5)3 can be used to effect formal 1,5‐alkyl migrations from the ester functional groups to unsaturated carbon–carbon
这项工作展示了一种新的催化环化反应,该反应使用高度路易斯酸的硼烷并伴有CH或CC键的形成。用B(C 6 F 5)3活化含炔的底物使得能够使用该路易斯酸对羧酸底物进行第一个催化的分子内环化反应。此外,酯的分子内环化使CC键形成为催化性B(C 6 F 5)3。可用于实现从酯官能团到不饱和碳-碳骨架的正式1,5-烷基迁移。该无金属方法用于在相对温和的条件下以极高的收率和极好的原子效率催化形成复杂的二氢吡喃酮和异香豆素。