4-Methylenedioxolan-2-ones as convenient synthons for the preparation of natural products of the berbine (cas 131-10-2) and calycotomine series
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Add time:09/25/2019 Source:infona.pl
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 (cas 131-10-2) was synthesized.
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