Synthesis of annulated oxazolidinones as potential precursors of cyclic cis-β-amino alcohols
作者:Yu. B. Chudinov、S. B. Gashev、N. B. Chernysheva、V. V. Semenov
DOI:10.1007/s11172-006-0225-z
日期:2006.1
A simple method for the synthesis of annulated 1,3-oxazolidin-2-ones from accessible ketones, acetylene, and carbon dioxide was developed. If their molecules contain arylalkyl substituents, intramolecular cyclization in acidic media gave rise to fused heterocyclic systems in high yields. The effects of the substituents in positions 3 and 5 of the oxazolidine ring on the regioselectivity of this cyclization
4-Methylenedioxolan-2-ones as convenient synthons for the preparation of natural products of the berbine and calycotomine series
作者:I. Yu. Titov、N. B. Chernysheva、Yu. B. Chudinov、A. A. Bogolyubov、V. V. Semenov
DOI:10.1007/s11172-006-0293-0
日期:2006.3
Intramolecular amidoalkylation of nonactivated 3-(2-arylethyl)-4-hydroxyoxazolidin-2-ones in polyphosphoric acid gave oxazolo[4,3-a]isoquinolin-3-one whose hydrolysis affords isoquinoline β-amino alcohols, calycotomine analogs. Using the developed procedure, 13,13,13a-trimethylberbine was synthesized.