Chemo- and Regioselective Functionalization of Uracil Derivatives. Applications to the Synthesis of Oxypurinol and Emivirine
作者:Nadège Boudet、Paul Knochel
DOI:10.1021/ol061295+
日期:2006.8.1
A novel route for the synthesis of 4,5-difunctionalized uracils using a chemo-and regioselective bromine/magnesium exchange reaction on 5-bromo-4-halogeno-2,6-dimethoxypyrimidines has been developed. Applications to the synthesis of pharmaceuticals such as oxypurinol and emivirine are reported.
Synthesis of azahomosteroid ring system through intramolecular [4+2] cycloaddition of in situ generated azaisobenzofuran intermediates
Azahomosteroid ringsystems were synthesized through two-component coupling of γ,δ-unsaturated Fischer carbene complexes with o-alkynylheteroaryl carbonyl derivatives. The reaction occurs through the formation of azaisobenzofuran as transient intermediate; the latter undergoes a subsequent Diels–Alder cycloaddition reaction with in-built dienophile with high regio- and stereoselectivity.