Reaktion #51504

Reaktionsgleichung

TMS diazomethane

6-methoxy-2-naphthoic acid

TMS diazomethane

→

product

Ausbeute 81.0%

6-Methoxy-2-naphthoic acid methyl ester

Ausbeute 81.0%

Lösungsmittel

benzene MeOH

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONAfter initial addition of reagent, TLC
2. 2
   Sonstigereaction
3. 3
   EinengenAfter concentration
4. 4
   Sonstigethe residue was recrystallized from MeOH

Vorschrift

To a stirred solution of 6-methoxy-2-naphthoic acid (10.0 g, 49.5 mmol) in benzene:MeOH (4:1, 200 mL) at 0° C. was added TMS diazomethane (29.7 mL, 2.0 M in hexnae, 59.4 mmol) dropwise. After initial addition of reagent, TLC showed reaction was not quite complete, so another 4 mL of TMS diazomethane added. The reaction was then stirred for 1 h before total completion. After concentration, the residue was recrystallized from MeOH:H2O to afford the product (8.67 g, 81%) as a solid; 1H NMR (DMSO-d6) δ3.85 (s, 3H), 3.87 (s, 3H), 7.22 (dd, J=2.6, 9.0 Hz, 1H), 7.37 (d, J=2.4 Hz, 1H), 7.85-7.92 (m, 2H), 8.00 (d, J=9.0 Hz, 1H), 8.51 (s, 1H); mass spectrum [(+) ESI], m/z 217 (M+H)+.

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