Benzene → HCID 20143103, compound

Participants

Reaction Steps

3,4-Dihydro-2-(4-hydroxyphenyl)-2-methoxy-4-methyl-3-oxo-2H-1,4-benzothiazine (0.2 g, compound No. 5) is dissolved in a mixture of acetic anhydride (2 ml) and pyridine (5 ml). The mixture is standed for 3 hours at room temperature, and then poured into a mixture of benzene and dilute hydrochloric acid. The organic layer is washed with water, dried over anhydrous sodium sulfate and concentrated in vacuo. The separated crystals are collected by filtration to give 0.1 g (52.7%) of the titled compound.

Provenance & Evidence