Snieckus氨基甲酸酯重排反应

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氨基甲酸-O-芳基酯进行邻位金属化后,氨基甲酰基由氧迁移到邻位的碳上得到邻酚基苯酰胺的反应。与Hauser–Beak反应类似。空间位置相近的位点也可以进行反应。


反应机理


反应实例

N,N-Diethyl-2-methoxy-3-carboxybenzamide (3). 1 (2.06 g, 8.7 mmol) in THF (10 mL) was added to s-BuLi (13.8 mL, 19.14 mmol) (1.39 M) and TMEDA (2.9 mL, 19.14 mmol) in THF (170 mL) under N2 at -78 ℃ with stirring. After slow heating for 12 h to 20 ℃, a 25% NH4Cl solution was added, the solvent was removed in vacuo and the residue extracted with Et2O. The aq layer was acidified, extracted with Et2O/DCM, the residue (1.7 g) was heated with MeI (10 mL) and K2CO3 (3 g) in Me2CO (30 mL) for 20 h. Chromatography (silica gel, EA:hexane 1:1) afforded 976 mg of ester which on hydrolysis (NaOH 3 g, MeOH 60 mL and water 10 mL, 24 h) gave after crystallization from DCM:hexane 84 mg of 3 (89%) mp 123–124 ℃.

【Snieckus V J Am Chem Soc 1985 107 6312】


相关文献

1 Snieckus V Heterocycles 1980 14 1649

2R Snieckus V Acc Chem Res 1982 15 306

3 Snieckus V J Org Chem 1983 48 1935

4 Snieckus V J Am Chem Soc 1985 107 6312

5R Snieckus V Chem Rev 1990 90 879

6 Snieckus V J Org Chem 1991 56 3763

7 Gawley RE J Org Chem 1993 58 3223

8 Collum DB J Am Chem Soc 2008 130 13709


编译自:Organic Syntheses Based On Name Reactions, 3RdEd, A. Hassner, Page 445-446.




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