Isobutylene → HCID 21187905, compound

HRID 1584976Notes

Reaction equation

[CH3:1][C:2](=[CH2:4])[CH3:3].[OH:5][C:6]1[CH:7]=[C:8]([CH:13]=[CH:14][C:15]=1[O:16][CH3:17])[C:9]([O:11][CH3:12])=[O:10].FC(F)(F)S(O)(=O)=O.C(N(CC)CC)C>ClCCl>[C:2]([O:5][C:6]1[CH:7]=[C:8]([CH:13]=[CH:14][C:15]=1[O:16][CH3:17])[C:9]([O:11][CH3:12])=[O:10])([CH3:3])([CH3:1])[CH3:4]

Participants

Conditions

Temperature: -70 °C

Procedure

A stirred solution of isobutylene (33 mL) in dichloromethane (60 mL) at -70° C. is treated dropwise with a cooled solution of methyl 3-hydroxy-4-methoxybenzoate (6 g) in dichloromethane (60 mL), followed by trifluoromethanesulfonic acid (0.3 mL). The reaction mixture is vigorously stirred at -70° C. for 3 hours and then between -70° C. and -50° C. overnight. It is then treated with triethylamine (0.6 mL) and allowed to warm to room temperature. The resulting yellow solution is concentrated, and the residue is subjected by mplc, using diethyl ether as eluent, to give methyl 3-tert-butoxy-4-methoxybenzoate (4.93 g), m.p. 98-100° C. [Elemental analysis: C,65.7; H,7.8%; calculated: C,65.5; H,7.6%].

Workup

custombetween -70° C. and -50° C. overnight
temperatureto warm to room temperature
concentrationThe resulting yellow solution is concentrated

Sources & evidence

ORD record: ord-ec13f12c04894a2ba254eab9241d3451
Source dataset: uspto-grants-1999_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05935978

Reaction notes

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