Methyl chloroformate → 2-Dipropylamino-8-methoxycarbonyl-1,2,3,4-tetrahydronaphthalene

HRID 274797Notes

Reaction equation

Br[C:2]1[CH:3]=[CH:4][CH:5]=[C:6]2[C:11]=1[CH2:10][CH:9]([N:12]([CH2:16][CH2:17][CH3:18])[CH2:13][CH2:14][CH3:15])[CH2:8][CH2:7]2.C([Li])CCC.CCCCCC.Cl[C:31]([O:33][CH3:34])=[O:32]>O1CCCC1.C(=O)(O)[O-].[Na+]>[CH2:13]([N:12]([CH2:16][CH2:17][CH3:18])[CH:9]1[CH2:8][CH2:7][C:6]2[C:11](=[C:2]([C:31]([O:33][CH3:34])=[O:32])[CH:3]=[CH:4][CH:5]=2)[CH2:10]1)[CH2:14][CH3:15]

Participants

Conditions

Temperature: -78 °C

Procedure

Alternatively, to a solution of 8-bromo-2-dipropylamino-1,2,3,4-tetrahydronaphthalene (220 mg, 0.71 mMol) in tetrahydrofuran (5 mL) at -78° C. was added a solution of n-butyl lithium in hexane (1.6 M, 1 mL, 1.6 mMol), and the solution was stirred for two hours at -78° C. The solution was then cannulated into a solution of methyl chloroformate (0.5 mL, 6.5 mMol) in tetrahydrofuran (10 mL) at -78° C., and the reaction mixture was allowed to warm gradually to room temperature. The reaction mixture was diluted with saturated aqueous sodium bicarbonate and was then extracted with diethyl ether. The combined extracts were dried over sodium sulfate and evaporated in vacuo to give a greenish-yellow oil. Purification by flash chromatography (3:1 hexane:tetrahydrofuran+tr. NH4OH) gave the title compound as a colorless glass (130 mg, 63%). The hydrochloride salt was formed and recrystallized (acetone/diethyl ether) to give colorless crystals (m.p.=132° C.).

Workup

temperatureto warm gradually to room temperature
extractionwas then extracted with diethyl ether
dry with materialThe combined extracts were dried over sodium sulfate
customevaporated in vacuo
customto give a greenish-yellow oil
customPurification by flash chromatography (3:1 hexane:tetrahydrofuran+tr. NH4OH)

Sources & evidence

ORD record: ord-32dd8015b42d47f3a5701d39217337df
Source dataset: uspto-grants-1995_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05389687

Reaction notes

Loading…