Diisopropylethylamine → 4-{2-[4-(6-Dimethylcarbamoyl-benzo[b]thiophen-2-yl)-5-methylpyrimidin-2-ylamino]-ethyl}-piperidine-1-carboxylic acid tert-butyl ester

HRID 1986219Notes

Reaction equation

HRID 1986219 reaction equation
[CH3:1][N:2]([CH3:22])[C:3]([C:5]1[CH:6]=[CH:7][C:8]2[CH:12]=[C:11]([C:13]3[C:18]([CH3:19])=[CH:17][N:16]=[C:15](Cl)[N:14]=3)[S:10][C:9]=2[CH:21]=1)=[O:4].[C:23]([O:27][C:28]([N:30]1[CH2:35][CH2:34][CH:33]([CH2:36][CH2:37][NH2:38])[CH2:32][CH2:31]1)=[O:29])([CH3:26])([CH3:25])[CH3:24].C(N(C(C)C)CC)(C)C>O1CCOCC1>[C:23]([O:27][C:28]([N:30]1[CH2:35][CH2:34][CH:33]([CH2:36][CH2:37][NH:38][C:15]2[N:14]=[C:13]([C:11]3[S:10][C:9]4[CH:21]=[C:5]([C:3](=[O:4])[N:2]([CH3:22])[CH3:1])[CH:6]=[CH:7][C:8]=4[CH:12]=3)[C:18]([CH3:19])=[CH:17][N:16]=2)[CH2:32][CH2:31]1)=[O:29])([CH3:26])([CH3:25])[CH3:24]

Participants

5

Reactant 3

HCID 81531DiisopropylethylamineHCID 1514258tert-Butyl 4-(2-aminoethyl)piperidine-1-carboxylateHCID 866253622-(2-Chloro-5-methylpyrimidin-4-yl)-benzo[b]thiophene-6-carboxylic acid dimethylamide

Product 1

HCID 688574434-{2-[4-(6-Dimethylcarbamoyl-benzo[b]thiophen-2-yl)-5-methylpyrimidin-2-ylamino]-ethyl}-piperidine-1-carboxylic acid tert-butyl ester

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Conditions

Temperature
97 °C

Procedure

A stirred mixture of 2-(2-chloro-5-methylpyrimidin-4-yl)-benzo[b]thiophene-6-carboxylic acid dimethylamide (473 mg, 1.43 mmol), 4-(2-aminoethyl)-piperidine-1-carboxylic acid tert-butyl ester (814 mg, 3.56 mmol) and diisopropylethylamine (0.747 mL, 4.29 mmol) in 1,4-dioxane (5 mL) is heated at 97° C. under nitrogen for 2 days. At room temperature the mixture is concentrated and the crude product is chromatographed on silica gel, eluting with MeOH in dichloromethane 0-2%, to give 4-{2-[4-(6-dimethylcarbamoyl-benzo[b]thiophen-2-yl)-5-methylpyrimidin-2-ylamino]-ethyl}-piperidine-1-carboxylic acid tert-butyl ester. The intermediate is then subject to deprotection by dissolving in dichloromethane (20 mL) and treating with triethylsilane (0.9 mL) and TFA (4 mL). The resultant yellow solution is stirred at room temperature for 1 hour. After concentration and subsequent chromatography on silica gel, eluting with 2.0 M NH3/MeOH in dichloromethane 3-12%, the fractions containing the desired product are collected and concentrated to give yellow foam. This foam is dissolved in MeOH (20 mL), treated with 0.5 N LiOH (20 mL) then concentrated to give the crude product of the title compound as yellow foam. It is used for next reductive methylation without further purification.

Workup

  1. concentrationAt room temperature the mixture is concentrated
  2. customthe crude product is chromatographed on silica gel
  3. washeluting with MeOH in dichloromethane 0-2%

Sources & evidence

ORD record
ord-808c1d2ff25e4aaa9e3104d2b3a2bf54
Source dataset
uspto-grants-2009_06
Patent number
US07547691B2

Reaction notes

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