Ammonium Chloride → 2-(4-Carbomethoxyphenyl)-5-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthalenyl)-pyrrole

HRID 346275Notes

Reaction equation

HRID 346275 reaction equation
[C:1]([C:5]1[CH:10]=[CH:9][C:8]([C:11](=O)[CH2:12][CH2:13][C:14]([C:16]2[CH:25]=[CH:24][C:23]3[C:22]([CH3:27])([CH3:26])[CH2:21][CH2:20][C:19]([CH3:29])([CH3:28])[C:18]=3[CH:17]=2)=O)=[CH:7][CH:6]=1)([O:3][CH3:4])=[O:2].[Cl-].[NH4+:32]>CN(C)C=O>[C:1]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[NH:32][C:14]([C:16]3[CH:25]=[CH:24][C:23]4[C:22]([CH3:27])([CH3:26])[CH2:21][CH2:20][C:19]([CH3:29])([CH3:28])[C:18]=4[CH:17]=3)=[CH:13][CH:12]=2)=[CH:7][CH:6]=1)([O:3][CH3:4])=[O:2]

Participants

4

Reactant 2

HCID 25517Ammonium ChlorideHCID 147264921-(4-Carbomethoxyphenyl)-4-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthalenyl)-butane-1,4-dione

Product 1

HCID 147265132-(4-Carbomethoxyphenyl)-5-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthalenyl)-pyrroleYield 46.4%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

8.0 g (20 millimoles) of 1-(4-carbomethoxyphenyl)-4-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthalenyl)-butane-1,4-dione (for preparation see Example 9) and 5.5 g (0.1 mole) of ammonium chloride in 150 ml of dry dimethylformamide were heated for 6 hours at 150° C. After cooling, the mixture was poured onto water and the precipitated crystals were filtered off under suction, washed several times with water and dried in a stream of nitrogen. Purification by column chromatography (silica gel; n-heptane plus increasing amounts of ethyl acetate) and recrystallization from ethanol gave 3.6 g of the title compound of melting point 176°-179° C.

Workup

  1. temperatureAfter cooling
  2. additionthe mixture was poured onto water
  3. filtrationthe precipitated crystals were filtered off under suction
  4. washwashed several times with water
  5. customdried in a stream of nitrogen
  6. customPurification
  7. temperatureby column chromatography (silica gel; n-heptane plus increasing amounts of ethyl acetate) and recrystallization from ethanol

Sources & evidence

ORD record
ord-5958f8379f2643ea8e59301ccb3287e0
Source dataset
uspto-grants-1991_10
Patent number
US05061705

Reaction notes

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