L-Lactic Acid → Onalespib Lactate

HRID 1486506Notes

Reaction equation

HRID 1486506 reaction equation
[OH:1][C:2]1[CH:7]=[C:6]([OH:8])[C:5]([CH:9]([CH3:11])[CH3:10])=[CH:4][C:3]=1[C:12]([N:14]1[CH2:22][C:21]2[C:16](=[CH:17][CH:18]=[C:19]([CH2:23][N:24]3[CH2:29][CH2:28][N:27]([CH3:30])[CH2:26][CH2:25]3)[CH:20]=2)[CH2:15]1)=[O:13].[C:31]([OH:36])(=[O:35])[C@H:32]([CH3:34])[OH:33]>C(O)C>[C:31]([OH:36])(=[O:35])[C@H:32]([CH3:34])[OH:33].[OH:1][C:2]1[CH:7]=[C:6]([OH:8])[C:5]([CH:9]([CH3:10])[CH3:11])=[CH:4][C:3]=1[C:12]([N:14]1[CH2:22][C:21]2[C:16](=[CH:17][CH:18]=[C:19]([CH2:23][N:24]3[CH2:29][CH2:28][N:27]([CH3:30])[CH2:26][CH2:25]3)[CH:20]=2)[CH2:15]1)=[O:13]

Participants

4

Reactant 2

HCID 107689L-Lactic AcidHCID 11955716Onalespib

Product 1

HCID 46915024Onalespib LactateYield 74%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent2×

Procedure

The product of Step 12 (646 g, 1.58 mol) was dissolved in ethanol (5.17 L) and the solution filtered. A solution of L-lactic acid (142 g, 1.58 mol) dissolved in ethanol (2.59 L) was filtered and added to the solution of the filtered solution (above) and then to the mixture was added EtOAc (7.75 L). The suspension was stirred at RT for 12 h and then cooled to 5° C. for a further 2 h. The solid which had formed was removed by filtration, washed with EtOAc (2×2.58 L) and heptane (2×1.94 L) and dried to constant weight at 35° C. giving the title compound (581 g, 74% yield).

Workup

  1. filtrationthe solution filtered
  2. filtrationwas filtered
  3. additionadded to the solution of the filtered solution (above)
  4. additionto the mixture was added EtOAc (7.75 L)
  5. temperaturecooled to 5° C. for a further 2 h
  6. customThe solid which had formed
  7. customwas removed by filtration
  8. washwashed with EtOAc (2×2.58 L) and heptane (2×1.94 L)
  9. customdried to constant weight at 35° C.

Sources & evidence

ORD record
ord-396f0c15de494065bdaa2e3f23ac7c1b
Source dataset
uspto-grants-2016_08
Patent number
US09428439B2

Reaction notes

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