2-Bromoethanol → HCID 11589375, compound

HRID 2261448Notes

Reaction equation

[CH3:1][C:2]1[CH:3]=[C:4]([CH2:10][CH2:11][C:12]([C:14]2[S:21][C:20]([CH3:22])=[C:19]3[C:15]=2[CH2:16][C@H:17]2[C:23]([CH3:25])([CH3:24])[C@H:18]23)=[O:13])[CH:5]=[C:6]([CH3:9])[C:7]=1[OH:8].Br[CH2:27][CH2:28][OH:29]>C(O)(C)C.[OH-].[Na+]>[OH:29][CH2:28][CH2:27][O:8][C:7]1[C:2]([CH3:1])=[CH:3][C:4]([CH2:10][CH2:11][C:12]([C:14]2[S:21][C:20]([CH3:22])=[C:19]3[C:15]=2[CH2:16][C@H:17]2[C:23]([CH3:25])([CH3:24])[C@H:18]23)=[O:13])=[CH:5][C:6]=1[CH3:9]

Participants

Conditions

Temperature: 70 °C

Procedure

A solution of 3-(3,5-dimethyl-4-hydroxy-phenyl)-1-((1aS,5aR)-1,1,2-trimethyl-1,1a,5,5a-tetrahydro-3-thia-cyclopropa[a]pentalen-4-yl)-propan-1-one (3.00 g, 8.46 mmol, Intermediate 10) in isopropanol (80 mL) and 2 N aq. NaOH (30 mL) is treated with 2-bromoethanol (2.11 g, 16.9 mmol). The dark red reaction mixture is stirred at 70° C. for 5.5 h. The solvent is removed under reduced pressure and the residue is dissolved in EA and washed twice with water. The organic layer is dried over MgSO4 and evaporated. The crude product is purified by CC on silica gel eluting with heptane:EA 1:1 to give 3-[4-(2-hydroxy-ethoxy)-3,5-dimethyl-phenyl]-1-((1aS,5aR)-1,1,2-trimethyl-1,1a,5,5a-tetrahydro-3-thia-cyclopropa[a]pentalen-4-yl)-propan-1-one (1.57 g) as an orange oil; LC-MS: tR=1.09 min, [M+1]+=399.35.

Workup

customThe dark red reaction mixture
customThe solvent is removed under reduced pressure
dissolutionthe residue is dissolved in EA
washwashed twice with water
dry with materialThe organic layer is dried over MgSO4
customevaporated
customThe crude product is purified by CC on silica gel eluting with heptane:EA 1:1

Sources & evidence

ORD record: ord-46e69f3634d04a1abc8ee2eab0f4de14
Source dataset: uspto-grants-2010_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07846964B2

Reaction notes

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