Stereoselective Synthesis of threo-4, 4, 4-Trichlorothreonine

抄録

threo-4, 4, 4-Trichlorothreonine was synthesized completely stereoselectively through trans-4-alkoxycarbonyl-5-trichloromethyl-2-oxazoline, which was prepared almost quantitatively by the reaction of 2-isocyano acetate with chloral in the presence of an organic base. Several derivatives of these compounds were also synthesized.
Furthermore, the stereochemistry of the resulting trichlorocompounds was chemically elucidated. The trichlorothreonine was easily converted into threo-threonine by hydrogenation over Pd/C in the presence of NaHCO₃.