反应详情

To a stirred solution of (4,5-Dichloro-thiophen-2-yl)-methanol (0.660 grams, 3.60 mmole), Phthalimide (0.636 grams, 4.32 mmole), and triphenyl phosphene (1.1 grams, 4.32 mmole) in tetrahydrofuran (20 ml) at room temperature was added diethyl azodicarboxylate (0.395 grams, 12.3 mmole) and stirred at room temperature over night. The mixture was poured into 100 ml water and extracted with diethyl ether. The combined extracts were washed with 1 N NaOH, water and brine, dried over MgSO4, filtered, and concentrated to an oil from which triphenylphosphine was crystalized out using diethyl ether/hexane. The mother liquor was concentrated to give a solid which was purified via flash chromatography on silica using 30% ethyl acetate/hexane as eluent to give a yellow solid. This was triturated in hexane to give a white solid (0.772 g). MW 312.18; MS (m/e) 313 (M++1).

1. extractionextracted with diethyl ether
2. washThe combined extracts were washed with 1 N NaOH, water and brine
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated to an oil from which triphenylphosphine
6. customwas crystalized out
7. concentrationThe mother liquor was concentrated
8. customto give a solid which
9. customwas purified via flash chromatography on silica using 30% ethyl acetate/hexane as eluent
10. customto give a yellow solid
11. customThis was triturated in hexane