반응 #61267

반응 방정식

{1-cyano-5-[6-methoxy-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-3-methyl-pent-3-enyl}-phosphonic acid diethyl ester

TMSBr

2,6-lutidine

→

desired product

수율 60.5%

[1-Cyano-5-(4-hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-isobenzofuran-5-yl)-3-methyl-pent-3-enyl]-phosphonic acid

수율 60.5%

용매

acetonitrile

반응 조건

후처리

1. 1
   기타before quenching with MeOH
2. 2
   기타The reaction mixture was dried under reduced pressure
3. 3
   기타the residue was purified by RP HPLC

실험 절차

To a solution of {1-cyano-5-[6-methoxy-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-3-methyl-pent-3-enyl}-phosphonic acid diethyl ester (35 mg, 0.065 mmol) in acetonitrile (2 mL) was added TMSBr (180 μL, 1.38 mmol) and 2,6-lutidine (160 μL, 1.38 mmol). The reaction solution was allowed stir at room temperature for one hour before quenching with MeOH. The reaction mixture was dried under reduced pressure and the residue was purified by RP HPLC using a C18 column with a gradient of H2O, 0.1% TFA-acetonitrile, 0.1% TFA to provide 15 mg (60%) of the desired product. 1H NMR (300 MHz, CD3OD) δ 1.86 (s, 3H), 2.15 (s, 3H), 2.38-2.57 (m, 2H), 3.17-3.28 (m, 1H), 3.44 (d, J=7.2 Hz, 2H), 3.80 (s, 3H), 5.25 (s, 2H), 5.47 (t, J=7.2 Hz, 1H) ppm; 31P (121.4 MHz, CD3OD) δ 15.28 ppm; MS (m/z) 380 [M−H]−, 382 [M+H]+.

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