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