Phosphorus oxychloride → Benzodiazepine

Participants

Reaction Steps

The title compound was prepared according to the procedures shown in the scheme below. Compound 5-chloroisatoic anhydride (A) was reacted with (R)-2-chlorophenylalanine to provide benzodiazepine-dione B based on procedures described in, for instance, Example 2. Reaction of benzodiazepine-dione B with para-methoxybenzyl chloride in the presence of base, according to procedures described in, for instance, Example 3, provided PMB-protected benzodiazepine-dione C. Conversion of benzodiazepine-dione C to imidoyl chloride D was accomplished using phosphorous oxychloride, based on procedures described in, for instance, Example 4. The benzimidazolone substituent was installed using Suzuki coupling, based on procedures described in, for instance, Example 7, to provide benzodiazepine E. Removal of the PMB protecting group was accomplished by reacting benzodiazepine E with AlCl3, based on procedures described in, for instance, Example 8, to provide benzodiazepine F.

Provenance & Evidence