Cesium carbonate → 6-(4-tert-Butyl-cyclohexyloxy)-3,4-dihydro-1H-isoquinoline-2-carboxylic acid tert-butyl ester

HRID 713985Notes

Reaction equation

HRID 713985 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:17][CH2:16][C:15]2[C:10](=[CH:11][CH:12]=[C:13]([OH:18])[CH:14]=2)[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].C(=O)([O-])[O-].[Cs+].[Cs+].[C:25]([CH:29]1[CH2:34][CH2:33][CH:32](OS(C)(=O)=O)[CH2:31][CH2:30]1)([CH3:28])([CH3:27])[CH3:26]>CC(O)(C)C.CC(=O)CC>[C:1]([O:5][C:6]([N:8]1[CH2:17][CH2:16][C:15]2[C:10](=[CH:11][CH:12]=[C:13]([O:18][CH:32]3[CH2:33][CH2:34][CH:29]([C:25]([CH3:28])([CH3:27])[CH3:26])[CH2:30][CH2:31]3)[CH:14]=2)[CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 10060623tert-Butyl 6-hydroxy-3,4-dihydroisoquinoline-2(1H)-carboxylateHCID 11128255Methanesulfonic acid 4-tert-butyl-cyclohexyl ester

Product 1

HCID 669267656-(4-tert-Butyl-cyclohexyloxy)-3,4-dihydro-1H-isoquinoline-2-carboxylic acid tert-butyl esterYield 58.6%

Reagents, catalysts & solvents 2

HCID 6386tert-ButanolSolventHCID 6569Methyl Ethyl KetoneSolvent

Conditions

Temperature
100 °C

Procedure

A mixture of 6-hydroxy-3,4-dihydro-1H-isoquinoline-2-carboxylic acid tert-butyl ester (1.1 g, 4.4 mmol), cesium carbonate (4.3 g, 13 mmol), and methanesulfonic acid 4-tert-butyl-cyclohexyl ester (2.2 g, 8.8 mmol) in t-BuOH (12 mL) and 2-butanone (6.0 mL) was heated in a sealed vial at 100° C. overnight. The mixture was partitioned between water and ether. The organic phase was washed with water, dried over MgSO4, filtered and concentrated. The residue was purified via a silica gel column eluted with EtOAc in hexanes from 0 to 30% to give white precipitate (1.0 g, yield: 58%). 1H NMR (400 MHz, CDCl3) δ 6.99 (d, 1H), 6.74 (dd, 1H), 6.67 (d, 1H), 4.49 (s, 2H), 4.07 (m, 1H), 3.61 (s, 2H), 2.78 (m, 2H), 2.18 (d, 2H), 1.85 (d, 2H), 1.48 (s, 9H), 1.37 (m, 2H), 1.18-1.00 (m, 3H), 0.87 (s, 9H).

Workup

  1. customThe mixture was partitioned between water and ether
  2. washThe organic phase was washed with water
  3. dry with materialdried over MgSO4
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe residue was purified via a silica gel column
  7. washeluted with EtOAc in hexanes from 0 to 30%

Sources & evidence

ORD record
ord-989fa183e51a41beb13679109e17cc76
Source dataset
uspto-grants-2015_11
Patent number
US09186367B2

Reaction notes

Loading…