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2005
Pyran derivatives
R 0340
Mercury(II) Chloride Mediated Cyclization—Rearrangement of O-PropargylDithioacetals to 3-Pyranone Dithioketals: An Expeditious Access
22- 132 glycolaldehyde
to 3-Pyranones. — The work describes a unique Hg(II)-mediated reaction of the title
compounds and an expedient general route to 6H-pyran-3-ones. The latter are obtained
exclusively or along with 2,5-dihydrofuran-3-carboxaldehydes. The presence of both
the dithioacetal and the alkyne functionalities is necessary for a successful reaction.
— (GHORAI, S.; BHATTACHARJYA*, A.; Org. Lett. 7 (2005) 2, 207-210; Indian
Inst. Chem. Biol., Jadavpur, Calcutta 700 032, India; Eng.) — Steudel
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