中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2-(2-硝基苯胺基)苯甲酸 | N-(2-nitrophenyl)anthranilic acid | 5933-35-7 | C13H10N2O4 | 258.233 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2-(2-氨基苯胺基)苯甲酸甲酯 | methyl 2-((2-aminophenyl)amino)benzoate | 5814-40-4 | C14H14N2O2 | 242.277 |
—— | methyl 2-(methyl(2-nitrophenyl)amino)benzoate | 16813-63-1 | C15H14N2O4 | 286.287 |
2-[(2-氨基苯基)氨基]苯甲酸 | 2-(2-aminophenylamino)benzoic acid | 27696-24-8 | C13H12N2O2 | 228.25 |
—— | 2-(2'-aminophenylamino)benzyl alcohol | 88116-39-6 | C13H14N2O | 214.267 |
Substrates that are insufficiently activated towards the hydrated imidazoline ring expansion (HIRE) process have been previously found to deliver exclusively the products of aminoalkyl side-chain ring expansion. Attempted reversal of the process by thermal activation towards HIRE failed. We have found that for such problematic substrates the HIRE-type ring expansion can be effectively achieved by applying lithium hexamethyldisilazide (LHMDS) in toluene. LHMDS is thought to promote intramolecular transamidation, which leads to ring-expanded 10- and 11-membered heterocyclic products in modest to good yields. The process significantly broadens the substrate scope amenable to the HIRE strategy.
Attempts to extend the hydrated imidazoline ring expansion (HIRE) strategy to a series of diarene-fused [1,4]diazepinones (earlier applied successfully to bis-pyrido substrate nevirapine) did not result in ring expansion but, rather, led to 2-aminoethyl side chain expulsion. This seeming setback (setting the limitations to the HIRE methodology substrate scope) led to the discovery of selective dopamine D2 ligands with elements of structure–activity relationships.