Methyl iodide → 9a-butyl-7-methoxymethoxy-2,2,4-trimethyl-1,2,9,9a-tetrahydro-3H-fluoren-3-one

HRID 7862

Reaction equation

[CH2:1]([C:5]12[CH2:17][CH:16]([CH3:18])[C:15](=[O:19])[C:14]([CH3:20])=[C:13]1[C:12]1[C:7](=[CH:8][C:9]([O:21][CH2:22][O:23][CH3:24])=[CH:10][CH:11]=1)[CH2:6]2)[CH2:2][CH2:3][CH3:4].[Li+].[CH3:26]C([N-]C(C)C)C.IC>C1COCC1>[CH2:1]([C:5]12[CH2:17][C:16]([CH3:26])([CH3:18])[C:15](=[O:19])[C:14]([CH3:20])=[C:13]1[C:12]1[C:7](=[CH:8][C:9]([O:21][CH2:22][O:23][CH3:24])=[CH:10][CH:11]=1)[CH2:6]2)[CH2:2][CH2:3][CH3:4]

Participants

Conditions

Temperature: -78 °C

Procedure

A solution of (2SR,9aSR)-9a-butyl-2,4-dimethyl-7-methoxymethoxy-1,2,9,9a-tetrahydro-3H-fluoren-3-one (39 mg, 0.12 mmol) in anhydrous THF (1.0 mL) was cooled in an ice bath, stirred under a nitrogen atmosphere, and treated with 0.4M LDA in THF (0.39 mL, 0.16 mmol). After stirring at 0° C. for 30 minutes, the yellow solution was cooled to −78° C. and treated with iodomethane (0.037 mL, 0.6 mmol). The resulting mixture was allowed to gradually warm to room temperature, then stirred at room temperature overnight. Workup as described in Example 18, step 2, afforded a crude product which was purified by PLC on a 0.1×20×20 cm silica gel GF plate, using 10:1 hexanes-EtOAc as developing solvent. The band at Rf 0.18-0.24 afforded 9a-butyl-7-methoxymethoxy-2,2,4-trimethyl-1,2,9,9a-tetrahydro-3H-fluoren-3-one (28 mg) as an oil.

Workup

stirringAfter stirring at 0° C. for 30 minutes
temperatureto gradually warm to room temperature
stirringstirred at room temperature overnight
customafforded a crude product which
customwas purified by PLC on a 0.1×20×20 cm silica gel GF plate

Sources & evidence

ORD record: ord-1cea5b97e21b47708df149edb4f91295
Source dataset: uspto-grants-2006_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07087599B2

Linked notes

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