Abstract
The synthesis of methoxy and hydroxy derivatives of 3,4-dihydro-3-(di- n-propylamino)-2 H-1-benzopyran from readily available or commercial o-hydroxybenzaldehydes is described in six steps. The enantiomers of 8-hydroxy-3,4-dihydro-3-(di- n-propylamino)-2 H-1-benzopyran 1b have been resolved. It is shown that the compound (−)- 1b is a more selective D-2 agonist, compared to apomorphine.
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