1,2-Dichloroethane → (S)-3,5-dichloro-4-(2-(3-(cyclopropylmethoxy)-4-(difluoromethoxy)phenyl)-2-(2-(trityloxy)acetoxy)ethyl)pyridine 1-oxide

HRID 1776554Notes

Reaction equation

HRID 1776554 reaction equation
[C:1]([O:20][CH2:21][C:22]([OH:24])=[O:23])([C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Cl:25][C:26]1[CH:27]=[N+:28]([O-:51])[CH:29]=[C:30]([Cl:50])[C:31]=1[CH2:32][C@@H:33]([C:35]1[CH:40]=[CH:39][C:38]([O:41][CH:42]([F:44])[F:43])=[C:37]([O:45][CH2:46][CH:47]2[CH2:49][CH2:48]2)[CH:36]=1)O.C(Cl)CCl.C([O-])([O-])=O.[K+].[K+]>C(Cl)Cl.CN(C1C=CN=CC=1)C>[Cl:25][C:26]1[CH:27]=[N+:28]([O-:51])[CH:29]=[C:30]([Cl:50])[C:31]=1[CH2:32][C@@H:33]([C:35]1[CH:40]=[CH:39][C:38]([O:41][CH:42]([F:44])[F:43])=[C:37]([O:45][CH2:46][CH:47]2[CH2:49][CH2:48]2)[CH:36]=1)[O:23][C:22](=[O:24])[CH2:21][O:20][C:1]([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)([C:14]1[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]=1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

7

Reactant 4

HCID 111,2-DichloroethaneHCID 11430Potassium CarbonateHCID 122307892-(Trityloxy)acetic acidHCID 71092687HCID 71092687, compound

Product 1

HCID 86679511(S)-3,5-dichloro-4-(2-(3-(cyclopropylmethoxy)-4-(difluoromethoxy)phenyl)-2-(2-(trityloxy)acetoxy)ethyl)pyridine 1-oxideYield 62.8%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolvent

Procedure

To a solution of 2-(trityloxy)acetic acid (7.2 g, 22.62 mmol) in DCM (250 ml), (S)-3,5-dichloro-4-(2-(3-(cyclopropylmethoxy)-4-(difluoromethoxy)phenyl)-2-hydroxyethyl)pyridine 1-oxide (7.92 g, 18.85 mmol), EDC (4.34 g, 22.62 mmol), and DMAP (4.60 g, 37.7 mmol) were added at RT. The solution was stirred at the same temperature overnight. A sat. sol. of K2CO3 was added, and the organic phase was separated, washed with HCl 2N and brine, dried over Na2SO4 and evaporated under vacuum. The resulting brown crude was purified by flash chromatography on silica gel (DCM 100% as eluent). (S)-3,5-dichloro-4-(2-(3-(cyclopropylmethoxy)-4-(difluoromethoxy)phenyl)-2-(2-(trityloxy)acetoxy)ethyl)pyridine 1-oxide was obtained (8.53 g, 11.84 mmol, 62.8% yield, MS/ESI+ 720.1 [MH]+).

Workup

  1. customthe organic phase was separated
  2. washwashed with HCl 2N and brine
  3. dry with materialdried over Na2SO4
  4. customevaporated under vacuum
  5. customThe resulting brown crude was purified by flash chromatography on silica gel (DCM 100% as eluent)

Sources & evidence

ORD record
ord-3ca39d08716443cabb4be178f3b1a2b9
Source dataset
uspto-grants-2016_02
Patent number
US09265768B2

Reaction notes

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