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Mercury(II) Chloride-Mediated Cyclization−Rearrangement of O-Propargylglycolaldehyde Dithioacetals to 3-Pyranone Dithioketals:  An Expeditious Access to 3-Pyranones

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journal contribution
posted on 20.01.2005, 00:00 by Subir Ghorai, Anup Bhattacharjya
O-Propargyl glycolaldehyde dithioacetals undergo a unique cyclization−rearrangement in the presence of mercuric chloride and calcium carbonate to afford 3-pyranones exclusively or along with 2,5-dihydrofuran-3-carboxaldehydes via their dithioketals and dithioacetals.