Aqueous base induced selective transformations of 3-(2-oxoalkyl) thiazolium cations
作者:Harjit Singh、Daman jit Singh、Subodh Kumar
DOI:10.1016/s0040-4020(01)81227-8
日期:1992.1
The title compounds react with aqueous sodium hydroxide (i) 2%, 1 equiv., (ii) 2%, 2 equiv., and (iii) 8%, 2 equiv., to give 2-hydroxy-2-alkyl/aryl-4-formyl-2, 3-dihydro- 1, 4-thiazines (7), 2-alkyl/aryl-4-formyl-1, 4-thiazines (8) and 2-aroylthiazoles (9), respectively. 7 and 8 with 8% aqueous sodium hydroxide form 9, but 7 with 2% aqueous sodium hydroxide or TFA give 8.