Scheme 17.

Transfer hydrogenative cycloaddition of α-ketols with benzannulated 1,5-diynes or ortho-acetylenic benzaldehydes.a
aYields are of material isolated by flash chromatography on silica gel.

Transfer hydrogenative cycloaddition of α-ketols with benzannulated 1,5-diynes or ortho-acetylenic benzaldehydes.a
aYields are of material isolated by flash chromatography on silica gel.