6-amino-3,4-dihydro-2H-1,4-benzothiazin-3-one → HCID 67222622, compound

Participants

Reaction Steps

A solution of 6-amino-4H-benzo[1,4]thiazin-3-one (10.68 g, 59.3 mmol; commercial) and tert-butyl-dimethyl-[(R)-2-oxiranyl-ethoxy]-silane (first eluting compound in step H.i.; 12.0 g, 59.3 mmol) in EtOH/H2O (9:1; 320 mL) was heated at 80° C. for 2 days. The mixture was concentrated under reduced pressure. Residual starting aniline could be removed by addition of Et2O/MeOH followed by filtration. The filtrate containing the product was concentrated under reduced pressure to afford the title intermediate as a brown oil (18.8 g, 83% yield) which was used as such in the next step.

Provenance & Evidence