Syntheses of Highly Substituted Furan and Pyrrole Derivatives via Lithiated 3-Aryl-1-methoxyallenes: Application to the Synthesis of Codonopsinine
作者:Hans-Ulrich Reissig、Morshed Chowdhury
DOI:10.1055/s-2006-949622
日期:2006.9
with aldehydes, ketones, or imines to give allenyl ad- ducts, which cyclized to highly substituted heterocycles either un- der basic conditions or with silver nitrate assistance. Analogously, a dihydropyrrole derivative was obtained by the addition of anisyl- substituted lithiated methoxyallene derivative to an N-tosyl imine and subsequent cyclization of the intermediate. The two diaste- reomers obtained