Lawesson's reagent → 9-Bromo-benzo[b]pyrrolo[3,2,1-jk][1,4]benzodiazepin-6(7H)-thione

Participants

Reaction Steps

A mixture of 9-bromobenzo[b]pyrrolo[3,2,1-jk][1,4]benzodiazepin-6(7H)-one (12.8 g), 2,4-bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane-2,4-disulfide (8.3 g), and toluene (500 ml) was refluxed for 2 hrs. The reaction mixture was allowed to stand overnight at room temperature. The precipitate was collected, washed with hexane, and dried overnight under vacuum at 40° C. to provide 9.6 g, (71.5%) of product. Recrystallization from chloroform gave the analytical sample, mp 214°-215° C.

Provenance & Evidence