Pyridine → (2S,5S)-tert-butyl 2-((tert-butyldimethylsilyloxy)methyl)-4-((ethoxycarbonyloxy)methyl)-5-hydroxy-5,6-dihydropyridine-1(2H)-carboxylate

HRID 627230Notes

Reaction equation

HRID 627230 reaction equation
[Si:1]([O:8][CH2:9][C@@H:10]1[CH:15]=[C:14]([CH2:16][OH:17])[C@H:13]([OH:18])[CH2:12][N:11]1[C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].N1C=CC=CC=1.Cl[C:33]([O:35][CH2:36][CH3:37])=[O:34]>ClCCl>[Si:1]([O:8][CH2:9][C@@H:10]1[CH:15]=[C:14]([CH2:16][O:17][C:33]([O:35][CH2:36][CH3:37])=[O:34])[C@H:13]([OH:18])[CH2:12][N:11]1[C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]

Participants

5

Reactant 3

HCID 1049PyridineHCID 10928Ethyl chloroformateHCID 89852454(2S,5S)-tert-butyl 2-((tert-butyldimethylsilyloxy)methyl)-5-hydroxy-4-(hydroxymethyl)-5,6-dihydropyridine-1(2H)-carboxylate2×

Product 1

HCID 89852382(2S,5S)-tert-butyl 2-((tert-butyldimethylsilyloxy)methyl)-4-((ethoxycarbonyloxy)methyl)-5-hydroxy-5,6-dihydropyridine-1(2H)-carboxylateYield 89%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

To a solution of (2S,5S)-tert-butyl 2-((tert-butyldimethylsilyloxy)methyl)-5-hydroxy-4-(hydroxymethyl)-5,6-dihydropyridine-1(2H)-carboxylate (Intermediate 217, 13.7 g, 36.67 mmol) in dichloromethane (20 mL) at 0° C. was added pyridine (5.93 mL, 73.35 mmol) followed by dropwise addition of ethyl chloroformate (3.87 mL, 40.34 mmol). The reaction was allowed to warm to room temperature over 3 hours. Diluted with dichloromethane and washed with saturated NH4Cl. Extracted with dichloromethane three times, combined and dried over Na2SO4. Removed solvent to give title compound as a yellow oil (14.5 g, 89%).

Workup

  1. washwashed with saturated NH4Cl
  2. extractionExtracted with dichloromethane three times
  3. dry with materialdried over Na2SO4

Sources & evidence

ORD record
ord-8a3e8e0603e74af9b781afa4a8960455
Source dataset
uspto-grants-2016_04
Patent number
US09309245B2

Reaction notes

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