Enantioselective synthesis of α,α-disubstituted amines from nitroalkenes
摘要:
Disubstituted nitroalkenes were converted into enantiomerically enriched amines (isolated as their hydrochloride salts) with enantiomeric excesses of 88 to > 95% in three steps: (a) highly stereoselective conjugate addition of the potassium salt of 4-phenyloxazolidin-2-one; (b) radical-mediated removal of the nitro group: (c) cleavage of the oxazolidinone. (C) 2001 Elsevier Science Ltd. All rights reserved.
3-Disubstituted N-phosphorylated aziridines except N-phosphorylated cyclohexenimine (4) do not react under the described conditions. Copper-mediated reaction of 2-phenyl-N-(diethoxyphosphoryl)aziridine (7) with Grignard reagents affords a mixture of regioisomers (8) and (9) but still with the preference of ring-opening at the carbon of lesser substitution.
Enantioselective synthesis of α,α-disubstituted amines from nitroalkenes
作者:Mary-Lorène Leroux、Thierry Le Gall、Charles Mioskowski
DOI:10.1016/s0957-4166(01)00323-8
日期:2001.7
Disubstituted nitroalkenes were converted into enantiomerically enriched amines (isolated as their hydrochloride salts) with enantiomeric excesses of 88 to > 95% in three steps: (a) highly stereoselective conjugate addition of the potassium salt of 4-phenyloxazolidin-2-one; (b) radical-mediated removal of the nitro group: (c) cleavage of the oxazolidinone. (C) 2001 Elsevier Science Ltd. All rights reserved.