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Optically active (S)-2-aryl-4 (or 5)-phenyl-1,3-oxazolines and (S)-2-fluoroalkyl-4-phenyl-1,3-oxazolines were synthesized from a tandem one-pot reaction of (S)-2-amino-2-phenylethanol with a corresponding carboxylic acid in toluene at 90 °C in the presence of PPh 3 /CBr 4 and excess Et 3 N. The use of aromatic carboxylic acids were determined to proceed through N-(2-bromo-1-phenyl-ethyl)-arylamides...
A facile preparation of 2-bromodifluoromethyl benzo-1,3-diazoles as novel CF 2 Br-containing heterocyclic building blocks has been developed through a one-pot process of reaction of 2-OH, 2-SH, or 2-NH 2 substituted aniline with bromodifluoroacetic acid in the presence of 3 molar equivalents of CBr 4 and Ph 3 P in refluxing toluene. 2-Bromodifluoromethyl benzo-1,3-thiazole...
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