Nickel-catalyzed hydrocarboxylation of ynamides with CO<sub>2</sub> and H<sub>2</sub>O: observation of unexpected regioselectivity
作者:Ryohei Doi、Iman Abdullah、Takahisa Taniguchi、Nozomi Saito、Yoshihiro Sato
DOI:10.1039/c7cc03127k
日期:——
α-amino-α,β-unsaturated esters with high regioselectivities. The selective α-carboxylation of ynamides with this catalytic protocol is unexpected in view of the electronic bias of ynamides and is in sharp contrast to our previous study in which a stoichiometric amount of Ni(0) was used to form a β-carboxylated product exclusively. We revealed that this unexpected C–C bond formation was induced by the
Synthesis of α-haloenamides via zinc halide mediated direct addition of benzhydryl halides to ynamides
作者:Ling Chen、Lian Yu、Yuan Deng、Yuming Cui、Gaofeng Bian、Jian Cao
DOI:10.1039/c5ob01950h
日期:——
stereoselective synthesis of highly substituted α-haloenamides was described via the zinc halide mediated direct addition of benzhydrylhalides to ynamides under mild conditions. The products α-haloenamides were further transformed into multisubstituted enamides via Suzuki and Sonogashira cross-coupling reactions.
A novel chalcogen-mediated metal-free oxyfunctionalization mode of ynamides for the synthesis of α-chalcogenyl acrylamides has been developed.
一种新颖的硒介导的无金属氧官能化模式已被开发用于合成α-硒基丙烯酰胺。
Regio- and Stereoselective Hydrophosphorylation of Ynamides for the Synthesis of β-Aminovinylphosphine Oxides
作者:Hai Huang、Hongjun Zhu、Jun Yong Kang
DOI:10.1021/acs.orglett.8b01065
日期:2018.5.4
A metal-free hydrophosphorylation of ynamides with diaryl phosphine oxides has been developed. A highly E-selective and β-regioselective hydrophosphorylation protocol has been established as a general method for the synthesis of diversely hydrophosphinylated products employing an in situ generated electrophilic phosphorus species. Deuterium incorporation experiments suggest that the amino phosphirenium
Synthesis of γ,δ-Unsaturated Esters and Amides via Au(I)-Catalyzed Reactions of Aryl Ynol Ethers or Ynamides with Allylic Alcohols
作者:Souta Misawa、Asaki Miyairi、Yoshihiro Oonishi、Yoshihiro Sato、Steven P. Nolan
DOI:10.1055/a-1559-3020
日期:2021.12
to their inherent unique reactivity. Herein, we report Au(I)-catalyzed hydroalkoxylation/Claisen rearrangement cascade reactions of aryl ynol ethers and ynamides with allylic alcohols. At the first stage (hydroalkoxylation) of this cascade reaction, attack of allylic alcohols to aryl ynol ethers or ynamides occurs at the α-position of the polarized alkynes in a completely regioselective manner. Claisen
炔醇醚和炔酰胺等极化炔烃因其固有的独特反应性而备受关注。在此,我们报告了 Au(I) 催化的芳基炔醇醚和炔酰胺与烯丙醇的加氢烷氧基化/克莱森重排级联反应。在该级联反应的第一阶段(加氢烷氧基化),烯丙醇对芳基炔醇醚或炔酰胺的攻击以完全区域选择性的方式发生在极化炔烃的 α 位。随后发生所得加合物的克莱森重排,分别得到 γ,δ-不饱和酯或酰胺。[Au(IPr)NTf2]催化剂对该反应最有效,反应在温和条件下进行(芳基炔醇醚:在THF中,60°C;在炔酰胺的情况下:在甲苯中,80° C) 以原子经济的方式。