Piperidine → HCID 10018452, compound

HRID 2175683Notes

Reaction equation

HRID 2175683 reaction equation
N1CCCCC1.[OH:7][C:8]1[CH:9]=[C:10]([CH:13]=[CH:14][C:15]=1[O:16][CH3:17])[CH:11]=O.C([CH2:21][C:22]([NH:24][C:25]1[CH:33]=[CH:32][CH:31]=[CH:30][C:26]=1[C:27]([OH:29])=[O:28])=[O:23])(O)=O>C1(C)C=CC=CC=1>[OH:7][C:8]1[CH:9]=[C:10](/[CH:11]=[CH:21]/[C:22]([NH:24][C:25]2[CH:33]=[CH:32][CH:31]=[CH:30][C:26]=2[C:27]([OH:29])=[O:28])=[O:23])[CH:13]=[CH:14][C:15]=1[O:16][CH3:17]

Participants

5

Reactant 3

HCID 8082PiperidineHCID 12127IsovanillinHCID 4399222-(2-Carboxyacetamido)benzoic acid

Product 1

HCID 10018452HCID 10018452, compoundYield 76.9%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

Piperidine (0.25 mL, 2.5 mmol) was added to a suspension of 3-hydroxy-4-methoxybenzaldehyde (0.39 g, 2.5 mmol) and 2-[(carboxyacetyl)amino]benzoic acid (0.50 g, 2.2 mmol) in toluene (5.0 mL). The reaction flask was fitted with a Dean-Stark apparatus and heated to reflux for 3 h, then cooled to rt and the resulting suspension was filtered and washed with toluene. The piperidinium salt was dissolved in MeOH (5.0 mL) and water (2.0 mL) at 40° C. and the solution was acidified with concentrated HCl. The precipitate was filtered, providing (E)-2-[[3-(3-hydroxy-4-methoxyphenyl)-1-oxo-2-propenyl]amino]benzoic acid (0.53 g, 76%) as a yellow crystalline solid; mp 215-216° C., lit.5 219-222° C.; δH (500 MHz, DMSO-d6) 3.81 (s, 3H, OCH3), 6.59 (d, J=15.5 Hz, 1H, CH═CHCO), 6.80 (d, J5′,6=8.5 Hz, 1H, H5′), 7.10-7.13 (m, 2H, H2′, H6′), 7.15 (t, J3,4=J4,5=8.0 Hz, 1H, H4), 7.47 (d, J=15.5 Hz, 1H, CH═CHCO), 7.60 (td, J4,5=J5,6=8.0, J3,5=1.5 Hz, 1H, H5), 7.99 (dd, J3,4=8.0, J3,5=1.5 Hz, 1H, H3), 8.58 (d, J5,6=8.0 Hz, 1H, H6), 11.25 (s, 1H, NH), 13.56 (br s, 1H, CO2H).

Workup

  1. customThe reaction flask was fitted with a Dean-Stark apparatus
  2. temperatureheated
  3. temperatureto reflux for 3 h
  4. filtrationthe resulting suspension was filtered
  5. washwashed with toluene
  6. dissolutionThe piperidinium salt was dissolved in MeOH (5.0 mL)
  7. customat 40° C.
  8. filtrationThe precipitate was filtered

Sources & evidence

ORD record
ord-639eaf460eb844299fb78a432bad2916
Source dataset
uspto-grants-2015_06
Patent number
US09062076B2

Reaction notes

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