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
A Green Synthetic Route to Imides from Terminal Alkynes and Amides by Simple Solid Catalysts
作者:Xiongjie Jin、Kazuya Yamaguchi、Noritaka Mizuno
DOI:10.1246/cl.2012.866
日期:2012.9.5
An atom-efficient and green synthetic route to highly valuable imides (54–92% yields) from terminal alkynes and amides has been developed. This new route is composed of two consecutive reactions, that is, (i) the reported Cu(OH)2-catalyzed cross-coupling of terminal alkynes and amides to ynamides and (ii) the Sn–W mixed oxide-catalyzed regioselective hydration of ynamides.
TMSOTf-mediated approach to 1,3-oxazin-2-one skeleton through one-pot successive reduction-[4 + 2] cyclization process of imides with ynamides
作者:Chen-Chen Zhang、Zhi-Peng Huo、Mei-Lin Tang、Yong-Xi Liang、Xun Sun
DOI:10.1016/j.tetlet.2021.152946
日期:2021.3
A one-pot approach to access functionalized 1,3-oxazin-2-one skeleton has been developed through successive reduction and subsequent [4 + 2] cyclization process of N-Boc lactams with ynamides by TMSOTf. As a result, a number of five to seven membered ring fused bicyclic [1,2-c][1], [3]oxazin-1-ones 12a-m and tricyclic derivatives 13a-f were obtained in moderate to excellent yields with excellent regioselectivities
Cu-Catalyzed Oxidative Amidation of Propiolic Acids Under Air via Decarboxylative Coupling
作者:Wei Jia、Ning Jiao
DOI:10.1021/ol1004615
日期:2010.5.7
A Cu-catalyzed aerobic oxidative amidation of propiolicacids via decarboxylation under air has been developed. Only carbon dioxide is produced as byproduct in this approach. The use of air as oxidant makes this method more useful and easy to handle.
Yb(<scp>iii</scp>)-catalysed <i>syn</i>-thioallylation of ynamides
作者:Manash Protim Gogoi、Rajeshwer Vanjari、B. Prabagar、Shengwen Yang、Shubham Dutta、Rajendra K. Mallick、Vincent Gandon、Akhila K. Sahoo
DOI:10.1039/d1cc02611a
日期:——
incorporating a sulfide moiety at the α-position and an allyl group at the β-position of the ynamide. The transformation is successful under ytterbium(III)-catalysis, providing access to highly substituted thioamino-skipped-dienes with broad substrate scope. Thus, tetrasubstituted olefins (with four different functionalgroups: amide, phenyl, thioaryl/alkyl, and allyl on the carbon centers) are made in a single
本文报道的是一种顺式结合在α位的烯丙基在炔酰胺的β位的硫化物部分和ynamides的-thioallylation。该转化在镱 ( III ) 催化下成功,提供了获得具有广泛底物范围的高度取代的硫氨基跳过二烯的途径。因此,四取代的烯烃(在碳中心上具有四个不同的官能团:酰胺、苯基、硫代芳基/烷基和烯丙基)是由易于获得的 ynamides 一步制成的,从而保持完整的原子经济性。该反应可扩展到由炔酰胺合成selenoamino二烯的顺式-selenoallylation。DFT 研究和控制实验提供了对反应机制的深入了解。