反应详情

A solution of 2,4-bis-benzyloxy-5-isopropenyl-benzoic acid (505 mg; 1.3 mmol) (Preparation B5), 5-nitroisoindoline, TFA (360 mg; 1 equiv.), EDAC (300 mg; 1.2 equiv.), HOBt (210 mg; 1.2 equiv.) and NEt3 (270 μl; 1.5 equiv.) in DMF (10 ml) was stirred at room temperature overnight then evaporated in vacuo The residue was partitioned between EtOAc and 2M HCl, the EtOAc layer was separated, washed with saturated NaHCO3, dried (MgSO4) and evaporated. Purification by flash column chromatography (1:4 then 1:2 then 1:1 EtOAc/P.E. as eluant) gave 460 mg of (2,4-bis-benzyloxy-5-isopropyl-phenyl)-(5-nitro-1,3-dihydro-isoindol-2-yl) methanone. MS: [M+H]+ 328.

1. customthen evaporated in vacuo The residue
2. customwas partitioned between EtOAc and 2M HCl
3. customthe EtOAc layer was separated
4. washwashed with saturated NaHCO3
5. dry with materialdried (MgSO4)
6. customevaporated
7. customPurification by flash column chromatography (1:4