作者:Alemayehu Gashaw Woldegiorgis、Zhao Han、Xufeng Lin
DOI:10.1002/adsc.202101011
日期:2022.1.18
An enantioselective synthesis of unnatural pyrazole-based α-chiral amino acidderivatives from the asymmetric reaction of N-aryl-5-aminopyrazoles with β,γ-alkynyl-α-imino esters using a chiral spirocyclic phosphoric acid catalyst was developed. Using the established methodology, various pyrazole-based α-aminoacidderivatives with tetrasubstituted carbon stereocenters were obtained in 67–98% yields
A new synthesis of alpha-quaternary alkynyl amino esters and allenoates was developed utilizing umpolung N-addition to beta,gamma-alkynyl alpha-imino esters followed by regioselective acylation. The reaction exhibits broad substrate generality and unique regioselectivity. Moreover, synthesis of alpha-quaternary alkynyl amino esters was also carried out via oxidation of the intermediary enolate followed by alkylation.
Uniquely functionalized tetrahydropyrido[2,1-b][1,3]oxazines: Diastereoselective 1:2 assembly from pyridines with oxalylacetylenes
作者:Kseniya V. Belyaeva、Veronika S. Gen'、Lina P. Nikitina、Andrei V. Afonin、Dmitrii V. Pavlov、Boris A. Trofimov
DOI:10.1016/j.tetlet.2021.153431
日期:2021.11
A straightforward access to 2-hydroxyoxazino[3,2-f ]phenanthridines from phenanthridine, oxalylacetylenes and water
作者:Kseniya V. Belyaeva、Lina P. Nikitina、Veronika S. Gen'、Anton V. Kuzmin、Andrei V. Afonin、Boris A. Trofimov