Acetic Acid → 7-chloro-N-cyclopropyl-2,3-dihydro-1H-inden-1-amine

HRID 511893Notes

Reaction equation

HRID 511893 reaction equation
[CH:1]1([NH2:4])[CH2:3][CH2:2]1.C(O)(=O)C.[Cl:9][C:10]1[CH:11]=[CH:12][CH:13]=[C:14]2[C:18]=1[C:17](=O)[CH2:16][CH2:15]2.C([BH3-])#N.[Na+]>CO>[Cl:9][C:10]1[CH:11]=[CH:12][CH:13]=[C:14]2[C:18]=1[CH:17]([NH:4][CH:1]1[CH2:3][CH2:2]1)[CH2:16][CH2:15]2

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 69828CyclopropylamineHCID 5003444Sodium cyanoborohydrideHCID 112174497-CHLORO-1-INDANONE

Product 1

HCID 684283077-chloro-N-cyclopropyl-2,3-dihydro-1H-inden-1-amineYield 89.9%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a cooled solution of 4.16 ml (60 mmol) of cyclopropylamine and 4.3 ml (75 mmol) of acetic acid, together with 5 g of 3 Å molecular sieves, in 80 ml of methanol, are added 5 g (30 mmol) of 7-chloro-2,3-dihydro-1H-inden-1-one. The reaction mixture is stirred for 4 hrs at reflux. The reaction mixture is then cooled to ambient temperature and 2.83 g (45 mmol) of sodium cyanoborohydride are slowly added. The reaction mixture is further stirred for 2 hrs at reflux. The solvent is removed under vacuum and 100 ml of water are then added to the residue and the pH is adjusted to 10 with sodium hydroxide. The watery layer is extracted three times with dichloromethane (3×50 ml); the combined organic layers are dried over magnesium sulphate and concentrated in vacuum to yield 5.6 g (80% yield) of 7-chloro-N-cyclopropyl-2,3-dihydro-1H-inden-1-amine as an brown oil (M+1=208).

Workup

  1. temperatureat reflux
  2. stirringThe reaction mixture is further stirred for 2 hrs
  3. temperatureat reflux
  4. customThe solvent is removed under vacuum and 100 ml of water
  5. additionare then added to the residue
  6. extractionThe watery layer is extracted three times with dichloromethane (3×50 ml)
  7. dry with materialthe combined organic layers are dried over magnesium sulphate
  8. concentrationconcentrated in vacuum

Sources & evidence

ORD record
ord-06da67e99ac34c8ea38834de83298e94
Source dataset
uspto-grants-2015_08
Patent number
US09102588B2

Reaction notes

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