Nonracemizable Isocyanoacetates for Multicomponent Reactions
摘要:
Chiral ortho esters of a-isocyano acids were synthesized from commercially available Cbz-protected alpha-amino acids. These compounds are stable toward racemization in the Ugi 4CC in contrast to known esters of alpha-isocyano acids. Applying them in Ugi 4CC with subsequent deprotection gives access to dipeptides with preserved configuration at the C-terminal amino acid.
Synthesis of Chiral Piperazinones Using Amphoteric Aziridine Aldehyde Dimers and Functionalized Isocyanides
作者:Niklas B. Heine、Sherif J. Kaldas、Lee Belding、Olga Shmatova、Travis Dudding、Valentine G. Nenajdenko、Armido Studer、Andrei K. Yudin
DOI:10.1021/acs.joc.6b00471
日期:2016.6.17
functionalized isocyanides in the aziridine aldehyde-driven multicomponent synthesis of piperazinones. High diasteroselectivity for each isocyanide was observed. A theoretical evaluation of the reaction course corroborates the experimental data. Moreover, the reactivity of cis- and trans-configured aziridine aldehyde dimers has been compared. This study further probes the dimer-driven mechanism of