Catecholborane → HCID 118307683, compound

HRID 718418Notes

Reaction equation

HRID 718418 reaction equation
O1C2C=CC=CC=2OB1.[Br:10][C:11]1[C:12]([N:27]2[CH2:32][CH2:31][C:30]([F:34])([CH3:33])[CH2:29][CH2:28]2)=[C:13]([C:19](=[O:26])[C:20]([O:22][CH:23]([CH3:25])[CH3:24])=[O:21])[C:14]([CH3:18])=[N:15][C:16]=1[CH3:17].CB1N2CCC[C@@H]2C(C2C=CC=CC=2)(C2C=CC=CC=2)O1>C1(C)C=CC=CC=1>[Br:10][C:11]1[C:12]([N:27]2[CH2:28][CH2:29][C:30]([F:34])([CH3:33])[CH2:31][CH2:32]2)=[C:13]([C@H:19]([OH:26])[C:20]([O:22][CH:23]([CH3:25])[CH3:24])=[O:21])[C:14]([CH3:18])=[N:15][C:16]=1[CH3:17]

Participants

5

Reactant 3

HCID 67506CatecholboraneHCID 9838490(R)-2-Methyl-CBS-oxazaborolidineHCID 118307830HCID 118307830, compound

Product 1

HCID 118307683HCID 118307683, compoundYield 95%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Conditions

Temperature
-15 °C

Procedure

The 0.67 mL of benzo[d][1,3,2]dioxaborole (751 mg, 3.13 mmol) was added to a nitrogen purged solution of isopropyl 2-(5-bromo-4-(4-fluoro-4-methylpiperidin-1-yl)-2,6-dimethylpyridin-3-yl)-2-oxoacetate (650 mg, 1.57 mmol) and 0.63 mL of (R)-1-methyl-3,3-diphenylhexahydropyrrolo[1,2-c][1,3,2]oxazaborole (174 mg, 0.63 mmol) in toluene (15 mL) at −60° C. and allowed to warm to −15° C. before being placed in the freezer overnight. The reaction was quenched with 1M Na2CO3, diluted with EtOAc, and stirred for 30 min. The organic layer was washed with sat'd Na2CO3 solution, brine and dried (MgSO4). The crude product was charged (DCM) to a 80 g ISCO silica gel cartridge and gradient elution (0-50% EtOAc/hexanes) using an Isolera chromatography station gave (S)-isopropyl 2-(5-bromo-4-(4-fluoro-4-methylpiperidin-1-yl)-2,6-dimethylpyridin-3-yl)-2-hydroxyacetate 620 mg (95%) as a mixture of diastereomers. 1H NMR (500 MHz, DMSO-d6) δ 5.88/5.86 (s, 1H), 4.95-4.93 (m, 1H), 3.85-3.81 (m, 1H), 3.56 (t, J=11.4 Hz, 1H), 3.23/3.03 (br. s, 1H), 2.76-2.74/2.65-2.62 (m, 1H), 2.53 (s, 3H), 2.39 (s, 3H), 1.91-1.71 (m, 4H), 1.39/1.35 (s, 3H), 1.14 (d, J=5.9 Hz, 3H), 1.07 (d, J=6.2 Hz, 3H). UPLC (M+H)=419.1.

Workup

  1. custombefore being placed in the freezer overnight
  2. customThe reaction was quenched with 1M Na2CO3
  3. additiondiluted with EtOAc
  4. washThe organic layer was washed with sat'd Na2CO3 solution, brine
  5. dry with materialdried (MgSO4)
  6. additionThe crude product was charged (DCM)
  7. washto a 80 g ISCO silica gel cartridge and gradient elution (0-50% EtOAc/hexanes)

Sources & evidence

ORD record
ord-af1fe8bf9bcc460d960931ef3030e4ba
Source dataset
uspto-grants-2015_11
Patent number
US09193720B2

Reaction notes

Loading…