Sodium Carbonate → (5-Chlorobenzofuran-3-yl)methanol

To a mixture of 4-chloro-2-iodophenol (1 g, 3.92 mmol), tert-butyl(3-(tert-butyldimethylsilyl)prop-2-ynyloxy)-dimethylsilane (1.93 g, 6.8 mmol), LiCl (0.15 g; 3.5 mmol) and Na2CO3 (0.636 g; 6 mmol) in anhydrous DMF (10 ml) Pd(OAc)2 (0.3 g) was added at 100° C. under N2 and heating was continued for 1.5 h. The solvent was removed in vacuo and the residue was diluted to 100 ml with EtOAc, washed with H2O, dried over MgSO4 and filtered. The filtrate was evaporated to dryness and the residue was purified by FCC (SiO2, hexane/EtOAc) to give the coupling product (0.64 g; 26%). This was dissolved in THF (5 ml) and 1M TBAF in THF (2 ml) was added to it and the mixture was stirred for 4 h at reflux. The solvent was distilled off and the residue was dilute to 50 ml with EtOAc, washed with 1M HCl, H2O, dried over MgSO4 and filtered. The filtrate was evaporated to dryness and the residue was purified by FCC (SiO2, hexane/EtOAc) to give the title compound (0.33 g; 99%), as creamy paste. 1H-NMR (CDCl3) 7.63 (d, 1H, J=2.11 Hz); 6.60 (b, 1H); 7.37 (d, 1H, J=8.72 Hz); 7.25 (dd, 1H, J=8.71, 2.13 Hz); 4.79 (s, 2H).

1. additionwas added at 100° C. under N2
2. temperatureheating
3. customThe solvent was removed in vacuo
4. additionthe residue was diluted to 100 ml with EtOAc
5. washwashed with H2O
6. dry with materialdried over MgSO4
7. filtrationfiltered
8. customThe filtrate was evaporated to dryness
9. customthe residue was purified by FCC (SiO2, hexane/EtOAc)
10. customto give the coupling product (0.64 g; 26%)
11. temperatureat reflux
12. distillationThe solvent was distilled off
13. additionthe residue was dilute to 50 ml with EtOAc
14. washwashed with 1M HCl, H2O
15. dry with materialdried over MgSO4
16. filtrationfiltered
17. customThe filtrate was evaporated to dryness
18. customthe residue was purified by FCC (SiO2, hexane/EtOAc)

ORDレコード

ord-c45c3999b8bc45b09b16235e10cabd74

出典データセット

uspto-grants-2015_11

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US09193716B2