Horlein, Ulrich published the artcileTetrahydrocarboline compounds. I., Synthetic Route of 52818-63-0, the publication is Chemische Berichte (1954), 463-72, database is CAplus.
Several 9-substituted tetrahydro-β- and -γ-carbolines were prepared; some had good antihistamine characteristics. PhCH2PhNNH2 (99 g.), 81 g. H2N(CH2)3CH(OEt)2, and 80 g. anhydrous ZnCl2 heated 3 h. at 180° gave 40-50% 1-benzyltryptamine (I), b0.2 194-202°; maleate, C21H22N2O4, m. 161-2°. I (40 g.) in 82 cc. 2N HCl and 2.5 l. H2O and 60 g. AcH, heated 1.5 h. at 90-5°, treated with K2CO3, and extracted with Et2O, gave 34% 1-methyl-9-benzyl-1,2,3,4-tetrahydro-β-carboline (II), b3 230-40°. II (27.6 g.) in 25 cc. MeOH treated dropwise at 10° with 450 cc. 95% HCO2H, left 5-6 h. at room temperature, heated on a water bath, HCO2Me distilled, the b.p. elevated to 90°, and HCO2H evaporated in vacuo, gave 76% 1,2-dimethyl-9-benzyl-1,2,3,4-tetrahydro-β-carboline, b0.5 205-15°; picrate, m. 197° (from HOAc). 1-Methyl-1,2,3,4-tetrahydro-β-carboline (III) was converted with HCHO and HCO2H to 63.5% 1,2-di-Me analog (IIIa), b1.5 180-90°, m. 116° (from ligroine). IIIa (20 g.) was boiled 1-2 h. with 4.5 g. PhMe-moistened NaNH2 in 150 cc. xylene, treated dropwise with 10.8 g. ClCH2CH2NMe2 in xylene, boiled 1-2 h., cooled, extracted with dilute HCl, the aqueous solution made alk. with NaOH, extracted with Et2O, and the extract distilled giving 59% 1,2-dimethyl-9-(β-dimethylaminoethyl)-1,2,3,4-tetrahydro-β-carboline, b1.5 205-15°; naphthalene-1,5-disulfonate, monohydrate, C27H33N3O6S2.H2O, m. 265° (from dilute MeOH-Me2CO). 9-Substituted 3-methyl-1,2,3,4-tetrahydro-γ-carboline derivatives (IV) were prepared from 1-methyl-4-piperidone (V) and N-substituted phenylhydrazines, RArNNH2 (VI). MeN(CH2CH2CO2Me)2 (609 g.) was poured into a solution of 69 g. Na in 1.3 l. MeOH, the MeOH distilled in vacuo, the mixture heated at 110-20°/3-5 mm., the Na salt of Me 1-methyl-4-oxo-3-piperidinecarboxylate dissolved in 900 g. concentrated H2SO4 in 2.5 l. H2O and refluxed 2-3 h. (to decarboxylate), a solution of 255 g. PhCH2PhNNH2 (VIa) in 115 g. concentrated H2SO4 and 2.3 l. H2O (which had been clarified with C) added quickly, the mixture refluxed 3-4 h., H2O added to give 8-9 l. volume, and 69% 3-methyl-9-benzyl-1,2,3,4-tetrahydro-γ-carboline (IVa) (IV, R = PhCH2, Z = H), b0 5 205-12°, m. 95° (from ligroine), precipitated as the sulfate; dissolved in MeOH and treated with naphthalene-1,5-disulfonic acid gave the naphthalene-1,5-disulfonate, C48H48N4O6S2 m. 280° (from HCONH2); HCl salt, m. 235-7° (from alc.). Other IV prepared were (R, Z, % yield, b.p., m.p., salt, and method of isolation of IV given): Ph, H, 62, b1.5 214-25°, 101.5-2.5° (from ligroine), -, distillation of base; Bu, H, over 60, b1.5 196-204°, -, maleate [m. 148-9° (from H2O)], distillation; EtSCH2CH2, H, about 70, b1 190-206°, -, maleate [m. 138° (from alc.-Et2O)], distillation; α-pyridylmethyl, H, 60, -, -, di-HCl salt [m. 140-1° (from alc.-Et2O)], precipitation of HCl salt; PhCH2, 7(?)-MeO, about 45, -, -, maleate [m. 168° (from alc.-Et2O)], precipitation of naphthalene-1,5-disulfonate from crude base in 8:2 Me2CO-MeOH and conversion to maleate; PhCH2, 7(?)-Cl (IVb), 45-55, -, 139-41°, HCl salt [m. 276° (from H2O)], naphthalene-1,5-disulfonate [m. 209-11° (from MeOH)], precipitation as HCl salt; EtOCH2CH2, H, 60-70, b0.5 170-80°, -, maleate [m. 141-2° (from alc.-Et2O)], distillation; Me2CHOCH2CH2, H, 68, b0.1 165-75°, -, maleate [m. 175-6° (from alc.)], HCl salt [m. 172-4° (from alc.-Et2O)], distillation; BuOCH2CH2, H, 68, -, -, naphthalene-1,5-disulfonate [m. 234° (from alc.-Me2CO)], precipitation of the naphthalenedisulfonate from base in Me2CO; Me2CHCH2OCH2CH2, H, 60-70, -, -, naphthalene-1,5-disulfonate [m. 235-6° (from alc.-Me2CO)], precipitation of the salt from the base in Me2CO; PhCH2, 6-Cl, 65, b0.1 205-7°, -, methanesulfonate [m. 198-9° (from MeOH-Et2O, precipitated in EtOAc)], distillation; p-ClC6H4CH2, H, about 70, b1 208-15°, 108° (from ligroine), -, distillation; cyclohexyl, H, 59, -, -, HCl salt [m. 251° (from H2O)], precipitation of HCl salt; PhCH2CH2, H, 63, -, -, HCl salt [m. 209-10° (from alc.-Et2O)], precipitation of HCl salt; PrOCH2CH2, H, 70, b0.5 172-85°, -, maleate [m. 144° (from alc.-Et2O)], distillation; Me, H, 71, b3 174°, 69-70° (from ligroine), maleate [m. 174° (from alc.-Et2O)], distillation; PhCH2, 7(?)-Br (IVc), 40-5, -, -, naphthalene-1,5-disulfonate (m. 222-4°), precipitation of HCl salt; cyclohexyloxyethyl, H, 64, -, -, maleate [m. 133° (from alc.-Et2O)], HCl salt [m. 209-10° (from alc.-Et2O)], precipitation of the maleate from crude base in EtOAc; PhOCH2CH2, H, 60-70, -, 129°, -, recrystallization of base from ligroine; p-ClC6H4CH2, 6-Cl, 72, -, 123-4° (from ligroine), methanesulfonate [m. 195-6° (from alc.)], precipitation of HCl salt; PhCH2, 5(?)-Cl (IVd) 10-20, -, 112° (from ligroine), naphthalene-1,5-disulfonate (m. about 300°), crystallization of salt on addition of MeOH and naphthalenedisulfonic acid to alc.-HCl mother liquor of IVb; PhCH2, 5(?)-Br, about 20, -, -, naphthalene-1,5-disulfonate (m. 303°), treatment of the mother liquor of IVc as for IVd; p-ClC6H4CH2, 7(?)-Cl, about 55, -, -, HCl salt [m. 280-2° (from H2O)], precipitation of HCl salt. The following new VI and RArNH (VII) were prepared (R, Ar, and b.ps. of VI and VII, resp., given): EtSCH2CH2, Ph, b8 173-80°, b20 165-75°; α-pyridylmethyl, Ph, b2-3 165-75°, b8 168-72°; PhCH2, m-MeOC6H4, b6 192-4°, b5 183-7°; PhCH2, m-ClC6H4, b5 190-5°, b5 182-6°; EtOCH2CH2, Ph, b5 136-42°, -; Me2CHOCH2CH2, Ph, b5 138-45°, b5 130-5°; BuOCH2CH2, Ph, b4-5 158-63°, b5 150-8°; Me2CHCH2OCH2CH2, Ph, b3 148-56°, b5 145-51°; PhCH2, p-ClC6H4, b4 187-93°, -; p-ClC6H4CH2, Ph, b2-3 180-5°, -; PhCH2CH2, Ph, b5 178-88°, -; PrOCH2CH2, Ph, b4 134-42°, b20 156-62°; PhCH2, m-BrC6H4, b0.1 210-20°, b0.1 160-8°; cyclohexyloxyethyl, Ph, b5 170-85°, b5 160-70°; PhOCH2CH2, Ph, b5 180-92°, -; p-ClC6H4CH2, p-ClC6H4, – (methanesulfonate, m. 201°), -; p-ClC6H4CH2, m-ClC6H4, b1.5 218-22°, b5 210°. VI were mainly obtained by nitrosation of VII and Zn dust reduction; VIa and p-ClC6H4CH2PhNNH2 were prepared from PhNHNH2 and the corresponding benzyl chloride. VII were prepared mainly from RCl or RBr with 2 mol ArNH2 without a solvent above 100°, but some were obtained by reduction of the corresponding Schiff bases. IV (R = Z = H) (18.6 g.) converted to its Na derivative by boiling 1-2 h. with 4.5 g. PhMe-moistened NaNH2 in 150 cc. absolute PhMe or xylene, with ClCH2CH2NMe2 added, and the crude base distilled, gave 70% IV (R = Me2NCH2CH2, Z = H), b2.5 200-5°; maleate, C24H31N3O8, m. 164-5° (from MeOH-Et2O); 73% IV (R = Et2NCO, Z = H) (VIIa) was similarly obtained using Et2NCOCl and precipitating from solution in Me2CO or MeOH as the naphthalene-1,5-disulfonate, m. 265-7° (from HOAc-Me2CO) [VIIa.HCl, m. 202-3° (from alc.-Et2O)]. Similar reactions using PhCH2Cl succeeded poorly or not at all, apparently as the result of extensive quaternization at the 3-position. IVa (27.6 g.) in 250 cc. Me2CO, refluxed 24 h. with 18 g. PhCH2Cl, gave 81% 3-methyl-3,9-dibenzyl-1,2,3,4-tetrahydro-γ-carbolinium chloride, m. 211-12° (from alc.-Et2O); at room temperature IVa treated with 14 g. Me2SO4 and the product precipitated by 250 cc. Et2O gave 90% 3,3-dimethyl-9-benzyl-1,2,3,4-tetrahydro-γ-carbolinium methosulfate, m. 217-18° (from alc.-Et2O). The Na derivative of 1-methyl-4-imino-3-cyanopiperidine (from 69 g. MeN(CH2CH2CN)2 in PhMe, filtered off under N, and washed with PhMe) was added carefully under CO2 to 250 g. concentrated H2SO4 in 1 l. H2O, the aqueous layer separated, 35 g. PhNHNH2, and 100 g. 20% H2SO4 added, the mixture refluxed 6-8 h., and made alk. giving C13H16N4, m. 123° (from C6H6), which may be the phenylhydrazone of 1-methyl-3-cyano-4-piperidone or VIII. α-(p-Methoxybenzylamino)pyridine (IX), m. 128°, was converted to the nitroso derivative, m. 56-7° (from ligroine), and reduced with Zn dust; some IX was recovered from the concentrated Et2O extracts by precipitation with ligroine and crude N,N-(p-methoxybenzyl)-α-pyridylhydrazine (X) was obtained by evaporation of the filtrate. X (20 g.) in 120 cc. alc. was treated in the cold with HCl, 14 g. V.HCl added, the mixture heated slightly on the water bath, then 2-3 h. at 70-80°, and Me2CO added to precipitate 5 g. V α-pyridylhydrazone-HCl, m. 224-5° (from MeOH-Me2CO); this was converted through the free base to the dimaleate, m. 142-3° (from alc. Et2O), and the dipicrate, m. 202-3° (from 90% HOAc-Et2O).
Chemische Berichte published new progress about 52818-63-0. 52818-63-0 belongs to ethers-buliding-blocks, auxiliary class Pyridine,Amine,Benzene,Ether, name is N-(4-Methoxybenzyl)pyridin-2-amine, and the molecular formula is C13H14N2O, Synthetic Route of 52818-63-0.
Referemce:
https://en.wikipedia.org/wiki/Ether,
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