Synthesis of unnatural α-amino esters using ethyl nitroacetate and condensation or cycloaddition reactions

被引:8
作者
Gagnot, Glwadys [1 ,2 ,3 ]
Hervin, Vincent [1 ,2 ]
Coutant, Eloi P. [1 ,2 ]
Desmons, Sarah [1 ,2 ]
Baatallah, Racha [1 ,2 ]
Monnot, Victor [1 ,2 ]
Janin, Yves L. [1 ,2 ]
机构
[1] Inst Pasteur, Dept Biol Struct & Chim, Unite Chim & Biocatalyse, 28 Rue Dr Roux, F-75724 Paris 15, France
[2] CNRS, Unite Mixte Rech 3523, 28 Rue Dr Roux, F-75724 Paris 15, France
[3] Univ Paris 05, Sorbonne Paris Cite, 12 Rue Ecole Med, F-75006 Paris, France
关键词
alpha-amino ester; alpha-nitro esters; cerium ammonium nitrate; cycloaddition; gold(I) cyclization; ALIPHATIC NITRO-COMPOUNDS; KNOEVENAGEL CONDENSATION; GEMINAL DIACETATES; PROPARGYLIC AMIDES; DERIVATIVES; ALDEHYDES; ACIDS; 4H-1,2-BENZOXAZINES; NITROALKANES; CYCLIZATION;
D O I
10.3762/bjoc.14.263
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
We report here on the use of ethyl nitroacetate as a glycine template to produce alpha-amino esters. This started with a study of its condensation with various arylacetals to give ethyl 3-aryl-2-nitroacrylates followed by a reduction (NaBH4 and then zinc/HCl) into alpha-amino esters. The scope of this method was explored as well as an alternative with arylacylals instead. We also focused on various [2 + 3] cycloadditions, one leading to a spiroacetal, which led to the undesired ethyl 5-(benzamidomethyl)isoxazole-3-carboxylate. The addition of ethyl nitroacetate on a 5-methylene-4,5-dihydrooxazole using cerium(IV) ammonium nitrate was also explored and the synthesis of other oxazole-bearing alpha-amino esters was achieved using gold(I) chemistry.
引用
收藏
页码:2846 / 2852
页数:7
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