Diastereoselective synthesis of nitroso acetals from (<i>S</i>,<i>E</i>)-γ-aminated nitroalkenes via multicomponent [4 + 2]/[3 + 2] cycloadditions promoted by LiCl or LiClO<sub>4</sub>
作者:Leandro Lara de Carvalho、Robert Alan Burrow、Vera Lúcia Patrocinio Pereira
DOI:10.3762/bjoc.9.96
日期:——
Chiral nonracemic aminated nitroso acetals were synthesized via diastereoselective multicomponent [4 + 2]/[3 + 2] cycloadditions employing new (S,E)-gamma-nitrogenated nitroalkenes 5a-c as heterodienes, ethylvinyl ether (EVE) as a dienophile, and selected electron-deficient alkenes as 1,3-dipolarophiles. The employment of different organic solutions of LiClO4 or LiCl as promoter systems provided the