Journal of Organic Chemistry published new progress about Analgesics. 25504-47-6 belongs to class piperidines, and the molecular formula is C7H11NO3, SDS of cas: 25504-47-6.
Mazur, Robert H. published the artcile< Resolution and configuration of 1-(3-hydroxy-3-phenylpropyl)-4-ethoxycarbonyl-4-phenylpiperidine>, SDS of cas: 25504-47-6, the main research area is .
The title carbinol, Ph(EtO2C)C5H8NCH2CH2CH(OR)Ph (I, R = H) (II), was prepared for pharmacol. evalution since it should exhibit greater stability than the corresponding ketone (III), a Mannich base with analgesic properties, and its resolution could lead to a separation of analgesic and respiratory depressant activities. III HCl salt (12.0 g.) in 48 ml. 50% alc. and 1.2 g. NaOH in 72 ml. alc. stirred 10 min. at 20° with 1.1 g. NaBH4, diluted with CHCl3, the washed and dried CHCl3 extract distilled, and the crystalline residue, m. 89-91°, in 60 ml. Me2CHOH treated with 6.6 ml. 6.8N HCl in Me2CHOH gave 96% material, recrystallized from Me2CHOH to give dl-II HCl salt, m. 198-9°. II (3.7 g.) in 40 ml. C5H5N and 10 ml. Ac2O heated on a steam bath briefly and kept 16 hrs. at 20°, excess Ac2O decomposed with H2O, the solution taken up in Et2O, and the product on evaporation treated with 1.3 g. maleic acid in Et2O gave 94% product, recrystallized to give I (R = Ac) H maleate salt (IV), m. 137-9°. Similarly, 3.7 g. II and 3.9 g. (EtCO)2O yielded I (R = EtCO) H maleate salt (V), m. 142-3°. II (3.7 g.) in 20 ml. C5H5N kept 3 hrs. with 3.5 ml. l-menthoxyacetyl chloride with occasional swirling, the clear cold solution (ice bath) treated with 2 ml. H2O and diluted with Et2O, the product from evaporation of the washed and dried Et2O extract taken up in 15 ml. EtOAc and heated with 1.4 g. maleic acid, the filtered solution concentrated, and the residue treated with 50 ml. dry Et 2O yielded 93% salt, m. 79-86°, [α]D -30°, crystallized (50 g.) from 150 ml. alc. and 2.5 ml. to give 9.2 g. material, m. 137-9°, recrystallized from 18 ml. alc. and 450 ml. Et2O to yield 33% I (R = menthoxyacetyl) l,l-hydrogen maleate (VI), m. 139-40°, [α]D -50° (1% MeOH). The optically pure VI (6.8 g.) in 70 ml. MeOH hydrolyzed with 2.8 g. KOH in 35 ml. 80% MeOH 15 min. at 20° and the solution diluted with 200 ml. H2O gave the free base (3.7 g., m. 83-4°), recrystallized from dilute MeOH to yield l-II, m. 86.0-6.5°, [α]D -21°, acidified (1.1 g.) in 5 ml. Me2CHOH with 1 ml. 6.8N HCl in Me2CHOH to give 0.9 g. salt, m. 187-8°, crystallized from 5 ml. Me2CHOH to yield 67% l-II HCl salt, m. 187-8°, [α]D -23°. l-II (1.1 g.) kept 16 hrs. at 20° in 10 ml. C5H5N and 5 ml. Ac2O, excess Ac2O decomposed with 5 ml. H2O, taken up in Et2O and the washed and dried Et2O layer added to 0.4 g. maleic acid in 0.8 ml. MeOH and 10 ml. Et2O, filtered from 1.5 g. product, m. 141-2°, and crystallized from 5 ml. alc. and 75 ml. Et2O yielded 87% l-IV, m. 142-3°, [α]D -22°. Similarly, use of (EtCO)2O gave 80% l-V, m. 143-4°, [α]D -23°. Acylation of 35.0 g. II with 22.1 g. d-menthoxyacetyl chloride yielded, after fractional crystallization, 49% optically pure I (R = menthoxyacetyl) d,d-hydrogen maleate (VII), m. 138.0-8.5°, [α]D 50°, hydrolyzed (13.6 g.) to give 5.2 g. d-II HCl salt, m. 186-7°, [α]D 25°. l-II (1.9 g.) acetylated, the oily ester taken up in 100 ml. dry C6H6 and refluxed 5 hrs. with BrCN, C6H6 removed, the residue refluxed 5 hrs. with 0.8 g. LiAlH4 in 100 ml. dry tetrahydrofuran, excess LiAlH4 destroyed with EtOAc, the mixture treated with dilute HCl and Et2O, the residue on evaporation of the Et2O layer heated 2 hrs. on a steam bath with 1.0 ml. α-C10H7NCO, excess reagent destroyed with 90% aqueous Me2CO, the residue on evaporation taken up in ligroine (b. 60-80°) and chromatographed over 20 g. silica gel, the column washed with 500 ml. 1:1 C6H6-ligroine and eluted with C6H6, and the fraction crystallized from ligroine gave 0.8 g. needles, m. 113-15°, recrystallized from ligroine to give l-α-C10H7NHCO2CHPhEt, m. 116-17°, [α]D -31.5°, also produced by conversion of l-HOCHPhEt (VII) to the urethan. A duplicate experiment using 3.7 g. racemic base gave dl-α-C10H7NHCO2CHPhEt, m. 102-3° (ligroine). VII had the S configuration and l-II was S-1-(3-hydroxy-3-phenylpropyl)-4-ethoxycarbonyl-4-phenylpiperidine. The analgesic potencies in mice are listed (morphine = 1): dl-II HCl, 14; dl-IV, 8; dl-V 14; l-II HCl, 25; l-IV, 11; l-V, 14; d-II, HCl, 7. An increase in analgesic activity was accompanied by an approximately corresponding increase in respiratory depression.
Journal of Organic Chemistry published new progress about Analgesics. 25504-47-6 belongs to class piperidines, and the molecular formula is C7H11NO3, SDS of cas: 25504-47-6.
Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem