Stannous chloride dihydrate → [[(Propane-1,3-diyl)dioxy]bis[(2-amino-5-methoxy-1,4-phenylene)carbonyl]]bis[2-(hydroxymethyl)4-methylidenepyrrolidine]

HRID 915709Notes

Reaction equation

HRID 915709 reaction equation
[CH2:1]([O:26][C:27]1[CH:32]=[C:31]([O:33][CH3:34])[C:30]([C:35]([N:37]2[CH2:41][C:40](=[CH2:42])[CH2:39][CH:38]2[CH2:43][OH:44])=[O:36])=[CH:29][C:28]=1[N+:45]([O-])=O)[CH2:2][CH2:3][O:4][C:5]1[CH:10]=[C:9]([O:11][CH3:12])[C:8]([C:13]([N:15]2[CH2:19][C:18](=[CH2:20])[CH2:17][CH:16]2[CH2:21][OH:22])=[O:14])=[CH:7][C:6]=1[N+:23]([O-])=O.O.O.Cl[Sn]Cl.C(Cl)(Cl)Cl.CO>CO>[CH2:3]([O:4][C:5]1[CH:10]=[C:9]([O:11][CH3:12])[C:8]([C:13]([N:15]2[CH2:19][C:18](=[CH2:20])[CH2:17][CH:16]2[CH2:21][OH:22])=[O:14])=[CH:7][C:6]=1[NH2:23])[CH2:2][CH2:1][O:26][C:27]1[CH:32]=[C:31]([O:33][CH3:34])[C:30]([C:35]([N:37]2[CH2:41][C:40](=[CH2:42])[CH2:39][CH:38]2[CH2:43][OH:44])=[O:36])=[CH:29][C:28]=1[NH2:45]

Participants

5

Reactant 3

HCID 61436Stannous chloride dihydrateHCID 21584188Chloroform methanol2×HCID 86606191[[(Propane-1,3-diyl)dioxy]bis[(2-nitro-5-methoxy-1,4-phenylene)carbonyl]]bis[2-(hydroxymethyl)-4-methylidenepyrrolidine]

Product 1

HCID 77687005[[(Propane-1,3-diyl)dioxy]bis[(2-amino-5-methoxy-1,4-phenylene)carbonyl]]bis[2-(hydroxymethyl)4-methylidenepyrrolidine]Yield 61%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

A mixture of the diol 35 (0.98 g, 1.49 mmol) and SnCl2.2H2O (3.36 g, 14.9 mmol) in MeOH (35 mL) was heated at reflux and the progress of the reaction monitored by TLC (90% CHCl3/MeOH). After 45 minutes, the MeOH was evaporated in vacuo and the resulting residue was cooled (ice), and treated carefully with saturated NaHCO3 (120 mL). The mixture was diluted with EtOAc (120 mL), and after 16 hours stirring at room temperature the inorganic precipitate was removed by filtration through celite. The organic layer was separated, washed with brine (100 mL), dried (MgSO4), filtered and evaporated in vacuo to give a brown solid. Flash chromatography (95% CHCl3/MeOH) afforded the pure bis-amine 36 as an orange solid (0.54 g, 61%): [α]19D=−31.8° (c=0.30, CHCl3); 1H NMR (270 MHz, CDCl3) δ 6.74 (s, 2Harom), 6.32 (s, 2Harom), 5.00 (br s, 2H, NCH2C═CH2), 4.93 (br s, 2H, NCH2C═CH2), 4.54 (br s, 2H, NCHCH2OH), 4.24-4.14 (m, 4H, OCH2CH2CH2O), 3.98-3.50 (m, 14H, NCHCH2OH, NCH2C═CH2 and OCH3), 2.76 (dd, 2H, J=8.61, 15.91 Hz, NCH2C═CH2CH2), 2.46-2.41 (m, 2H, NCH2C═CH2CH2), 2.33-2.28 (m, 2H, OCH2CH2CH2O); 13C NMR (67.8 MHz CDCl3) δ 171.0 (NC═O), 151.0 (Cquat), 143.5 (Cquat), 141.3 (Cquat), 140.6 (Cquat), 112.4 (C—Harom), 111.9 (Cquat), 107.8 (NCH2C═CH2), 102.4 (C—Harom), 65.2 (OCH2CH2CH2O), 65.0 (NCHCH2OH), 59.8 (NCHCH2OH), 57.1 (OCH3), 53.3 (NCH2C═CH2), 34.4 (NCH2C═CH2CH2), 29.0 (OCH2CH2CH2O); MS (FAB) (Relative Intensity) 596 (M+, 13), 484 (M-NCH2CCH2CH2CHCH2OH, 14), 389 (10), 371 (29), 345 (5), 224 (8), 206 (44), 166 (100), 149 (24), 112 (39), 96 (34), 81 (28); IR (NUJOL7) 3600-3000 (br, OH), 3349 (NH2), 2922, 2852, 2363, 1615, 1591 (NH2), 1514, 1464, 1401, 1359, 1263, 1216, 1187, 1169, 1114, 1043, 891, 832, 761 cm−1.

Workup

  1. temperaturewas heated
  2. temperatureat reflux
  3. customthe MeOH was evaporated in vacuo
  4. temperaturethe resulting residue was cooled (ice)
  5. additiontreated carefully with saturated NaHCO3 (120 mL)
  6. additionThe mixture was diluted with EtOAc (120 mL)
  7. customwas removed by filtration through celite
  8. customThe organic layer was separated
  9. washwashed with brine (100 mL)
  10. dry with materialdried (MgSO4)
  11. filtrationfiltered
  12. customevaporated in vacuo
  13. customto give a brown solid

Sources & evidence

ORD record
ord-657656a39b694f6dbcb24c10c90ca146
Source dataset
uspto-grants-2007_09
Patent number
US07265105B2

Reaction notes

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