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
The synthesis of ynamides in water was achieved by a micellarcatalysis strategy using rosin‐based surfactant APGS‐550‐M, which can be easily prepared from natural abundant biomass.
Synthesis of Amide Enol Carbamates and Carbonates through Cu(OTf)<sub>2</sub>-Catalyzed Reactions of Ynamides with <i>t</i>-Butyl Carbamates/Carbonates
作者:Pan Han、Zhuo-Ya Mao、Ming Li、Chang-Mei Si、Bang-Guo Wei、Guo-Qiang Lin
DOI:10.1021/acs.joc.9b03512
日期:2020.4.3
A highly regioselective approach to access amide enol carbamates and carbonates 5a–5c′, 7a–7h, and 9 was developed through Cu(OTf)2-catalyzed reactions of ynamides 4 with t-butyl carbamates 2 and 8 and t-butyl carbonates 6. Moreover, this strategy was successfully applied to generate amide enol carbamates 11a–11s and 14a–14f from imides 10 and 13 with ynamides through an N-Boc cleavage–addition ring-opening
N-Substitution dependent stereoselectivity switch in palladium catalyzed hydroalkynylation of ynamides: a regio and stereoselective synthesis of ynenamides
作者:Vikas Dwivedi、Madala Hari Babu、Ruchir Kant、Maddi Sridhar Reddy
DOI:10.1039/c5cc06251a
日期:——
A palladium catalysed regioselective hydroalkynylation of ynamides for ynenamides is achieved with an N-substitution dependent stereoselectivity switch.