Scheme 21.
Synthesis of 1,3-thiazinan-4-one-1,1-dioxide derivatives 80. (a) aldehyde (R1C6H4CHO), primary amine (R2NH2), benzene, reflux 48 h; (b) AcOH, KMnO4, >30 °C; (c) NaHCO3.
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