Triphenylphosphine → tert-butyl 4-{[1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate

HRID 2203563Notes

Reaction equation

HRID 2203563 reaction equation
C(OC([N+](C(OC(C)C)=O)=[N-])=O)(C)C.[CH3:15][C:16]1([CH3:40])[O:20][CH:19]([CH2:21][N:22]2[C:34]3[C:33]4[CH:32]=[CH:31][C:30]([OH:35])=[CH:29][C:28]=4[N:27]=[CH:26][C:25]=3[N:24]=[C:23]2[CH2:36][O:37][CH2:38][CH3:39])[CH2:18][O:17]1.O[CH:42]1[CH2:47][CH2:46][N:45]([C:48]([O:50][C:51]([CH3:54])([CH3:53])[CH3:52])=[O:49])[CH2:44][CH2:43]1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>O1CCCC1>[CH3:15][C:16]1([CH3:40])[O:20][CH:19]([CH2:21][N:22]2[C:34]3[C:33]4[CH:32]=[CH:31][C:30]([O:35][CH:42]5[CH2:47][CH2:46][N:45]([C:48]([O:50][C:51]([CH3:54])([CH3:53])[CH3:52])=[O:49])[CH2:44][CH2:43]5)=[CH:29][C:28]=4[N:27]=[CH:26][C:25]=3[N:24]=[C:23]2[CH2:36][O:37][CH2:38][CH3:39])[CH2:18][O:17]1

Participants

6

Reactant 4

HCID 11776TriphenylphosphineHCID 643502Tert-butyl 4-hydroxypiperidine-1-carboxylateHCID 22145704Diisopropyl diazodicarboxylateHCID 1363478501-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-ol

Product 1

HCID 68973605tert-butyl 4-{[1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylateYield 76.6%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

A solution of diisopropyldiazodicarboxylate (0.710 g, 3.50 mmol) in tetrahydrofuran (6 mL) was added dropwise to a mixture of 1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-ol (prepared as described in Parts A-D of Example 372, 1.00 g, 2.80 mmol), tert-butyl 4-hydroxypiperidine-1-carboxylate (0.70 g, 3.50 mmol), and triphenylphosphine (0.920 g, 3.50 mmol) in tetrahydrofuran (35 mL) at 0° C. The resulting solution was allowed to warm to room temperature over 16 hours. The solution was concentrated under reduced pressure. The crude product was purified by chromatography (silica gel, gradient elution with 0-50% CMA in chloroform) to provide 1.16 g of tert-butyl 4-{[1-[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-7-yl]oxy}piperidine-1-carboxylate as a white foam.

Workup

  1. concentrationThe solution was concentrated under reduced pressure
  2. customThe crude product was purified by chromatography (silica gel, gradient elution with 0-50% CMA in chloroform)

Sources & evidence

ORD record
ord-b5b13b845c90440fb4d0f077a03b86df
Source dataset
uspto-grants-2016_06
Patent number
US09365567B2

Reaction notes

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