7-methoxy-1-benzofuran-3-carboxylic acid
Title | Journal |
---|---|
Regiospecific and stereoselective syntheses of (+/-) morphine, codeine, and thebaine via a highly stereocontrolled intramolecular 4 + 2 cycloaddition leading to a phenanthrofuran system. | Journal of the American Chemical Society 20090819 |