반응 #594779

반응 방정식

benzyl iodide

2-thienylmagnesium bromide

2-thienylmagnesium bromide

→

title compound

2-Benzylthiophene

용매

THF

반응 조건

후처리

1. 1
   기타was fitted with an addition funnel
2. 2
   온도to maintain the reaction temperature <40° C.
3. 3
   기타The THF was removed in vacuo
4. 4
   기타the residue was partitioned between 250 mL of Et2O and 150 mL of NH4Cl
5. 5
   기타separated
6. 6
   workup.ADDITIONThe organic layer was treated with 15 mL of piperidine
7. 7
   workup.STIRRINGstirred for 18 h
8. 8
   세척washed twice with 10% (w/v) aqueous HCl
9. 9
   여과filtered
10. 10
    농축concentrated
11. 11
    기타the dark red residue was purified by flash chromatography
12. 12
    세척eluting with neat hexane

실험 절차

A solution of 7.8 g (52 mmol) of NaI and 5 mL (43 mmol) of benzyl chloride in THF was heated at reflux for 2 h to form benzyl iodide in situ and then the reaction was cooled to rt. In a separate flask, 37 mg (0.87 mmol) of LiCl and 58 mg (0.43 mmol) of copper(II) chloride were dissolved in 5 mL of THF and stirred at rt for 5 min to form Li2CuCl4 in situ. The benzyl iodide reaction flask was fitted with an addition funnel and 3 mL (3 mmol) of a 1 M solution of 2-thienylmagnesium bromide in THF was added dropwise, followed by addition of the Li2CuCl4 solution, and then the remaining 2-thienylmagnesium bromide solution (49 mL, 49 mmol) was added at such a rate as to maintain the reaction temperature <40° C. and the reaction solution was stirred for 2 h at rt. The THF was removed in vacuo, and the residue was partitioned between 250 mL of Et2O and 150 mL of NH4Cl and separated. The organic layer was treated with 15 mL of piperidine and stirred for 18 h, then washed twice with 10% (w/v) aqueous HCl, filtered, concentrated and the dark red residue was purified by flash chromatography eluting with neat hexane to yield the title compound. GC-MS (M)+ 174.

출처