Hydrochloric Acid → (R,Z)-2-tert-butyl 8a-methyl 7-(hydroxymethylene)-6-oxo-3,4,6,7,8,8a-hexahydroisoquinoline-2,8a(1H)-dicarboxylate

HRID 537256Notes

Reaction equation

HRID 537256 reaction equation
C[Si](C)(C)[N-][Si](C)(C)C.[Li+].[O:11]=[C:12]1[CH2:21][CH2:20][C@@:19]2([C:22]([O:24][CH3:25])=[O:23])[C:14]([CH2:15][CH2:16][N:17]([C:26]([O:28][C:29]([CH3:32])([CH3:31])[CH3:30])=[O:27])[CH2:18]2)=[CH:13]1.[CH:33](OCC(F)(F)F)=[O:34].Cl>CCOCC.C(OCC)(=O)C.O>[OH:34]/[CH:33]=[C:21]1\[C:12](=[O:11])[CH:13]=[C:14]2[C@:19]([C:22]([O:24][CH3:25])=[O:23])([CH2:20]\1)[CH2:18][N:17]([C:26]([O:28][C:29]([CH3:32])([CH3:31])[CH3:30])=[O:27])[CH2:16][CH2:15]2

Participants

8

Reactant 4

HCID 313Hydrochloric AcidHCID 1416812,2,2-Trifluoroethyl formateHCID 2733832Lithium HexamethyldisilazideHCID 109468002-tert-butyl 8a-methyl (8aR)-6-oxo-1,2,3,4,6,7,8,8a-octahydroisoquinoline-2,8a-dicarboxylate

Product 1

HCID 58333286(R,Z)-2-tert-butyl 8a-methyl 7-(hydroxymethylene)-6-oxo-3,4,6,7,8,8a-hexahydroisoquinoline-2,8a(1H)-dicarboxylateYield 100%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 3283Diethyl EtherSolvent2×HCID 8857Ethyl AcetateSolvent

Conditions

Temperature
-78 °C

Procedure

Lithium hexamethyldisilazide (12.93 ml, 12.93 mmol) was added to diethyl ether (20 mL) at −78° C. (R)-2-tert-butyl 8a-methyl 6-oxo-3,4,6,7,8,8a-hexahydroisoquinoline-2,8a(1H)-dicarboxylate (WO2005087769) (1.0 g, 3.23 mmol) in ether (5 mL) was added followed by the addition of 2,2,2-trifluoroethyl formate (2.51 ml, 25.9 mmol) after 20 minutes. The reaction was stirred at −78° C. for 2 hours then allowed to slowly warm to room temperature. 1M hydrochloric acid (8 mL) was added, followed by water (10 mL) and ethyl acetate (10 mL). The organic phase was separated, washed with brine, dried (magnesium sulfate) and solvent removed to give (R,Z)-2-tert-butyl 8a-methyl 7-(hydroxymethylene)-6-oxo-3,4,6,7,8,8a-hexahydroisoquinoline-2,8a(1H)-dicarboxylate (1.09 g) as a yellow oil. LCMS (Method F, ES-API): RT 1.99 min, m−H=336.

Workup

  1. additionwas added
  2. temperatureto slowly warm to room temperature
  3. customThe organic phase was separated
  4. washwashed with brine
  5. dry with materialdried (magnesium sulfate) and solvent
  6. customremoved

Sources & evidence

ORD record
ord-1125ef8162c84c72957e49a467001e22
Source dataset
uspto-grants-2014_10
Patent number
US08859774B2

Reaction notes

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