Efficient Monohydroxyarylation (or Alkylation) and Symmetrical Bis-Hydroxyarylation (or Alkylation) of 2,5-Dimethyl-L,3,4-Thiadiazole
摘要:
2,5-dimethyl-1,3,4-thiadiazole (1) under bar reacts at low temperature sequentially with lithium diisopropylamide and carbonyl derivatives (2) under bar to prepare, according to the ratio of reagents, either 2-methyl-5-[2-hydroxy-2-arylethyl (or alkyl)]-1,3,4-thiadiazoles (3) under bar or 2,5-bis[2-hydroxy-2-arylethyl (or alkyl)l-l,3,4-thiadiazoles (4) under bar.
2,5-dimethyl-1,3,4-thiadiazole (1) under bar reacts at low temperature sequentially with lithium diisopropylamide and carbonyl derivatives (2) under bar to prepare, according to the ratio of reagents, either 2-methyl-5-[2-hydroxy-2-arylethyl (or alkyl)]-1,3,4-thiadiazoles (3) under bar or 2,5-bis[2-hydroxy-2-arylethyl (or alkyl)l-l,3,4-thiadiazoles (4) under bar.