Isothiocyanate Strategy for the Synthesis of Quaternary α-Amino Acids Bearing a Spirocyclic Ring System
作者:Sebastian Frankowski、Tadeusz Gajda、Łukasz Albrecht
DOI:10.1002/adsc.201701642
日期:2018.5.2
isothiocyanates derived from α‐substituted α‐aminoacids are useful building blocks in the heteroannulation reactions with electron‐deficient olefins. The developed strategy proceeds in a cascade manner and involves Michael addition followed by a cyclization via nucleophilic addition. Target, spirocyclic heterocycles bearing either a quaternary α‐aminoacidmoiety or α‐aminophosphonate group have been
describe a convenient method for the syntheses of novel 1-isothiocyano-alkylphosphonate diaryl ester derivatives and their antiproliferative activity. The syntheses are based on dithiocarbamates obtained in situ with the use of carbon disulfide under basic conditions, and their desulfurization using several different reagents, of which hydrogen peroxide proved to be the most efficient. The compounds synthesized