Stereocontrolled synthesis of hydroxyethylamine isosteres via chiral sulfoxide chemistry
摘要:
A novel synthesis of enantiopure hydroxyethylamine isosteres has been developed. Reaction of lithiated beta-sulfinyl-ethylamines 3 with N-Cbz-irnines generated in situ from alpha-amino-sulfones 4 afforded in good to excellent yields and moderate stereocontrol the 2-sulfinyl-1,3-diamines 2. The latter were submitted to the nonoxidative Pummerer reaction (NOPR) in CH2Cl2, that produced the target compounds 1 in very good yields with inversion Of Configuration. In some cases, the use of acetonitrile as solvent resulted in a double-inversion pathway, leading for example to the oxazolidinone 5. The total synthesis of an epimer of Saquinavir has been achieved by this method. (C) 2004 Elsevier Ltd. All rights reserved.
Stereocontrolled synthesis of hydroxyethylamine isosteres via chiral sulfoxide chemistry
摘要:
A novel synthesis of enantiopure hydroxyethylamine isosteres has been developed. Reaction of lithiated beta-sulfinyl-ethylamines 3 with N-Cbz-irnines generated in situ from alpha-amino-sulfones 4 afforded in good to excellent yields and moderate stereocontrol the 2-sulfinyl-1,3-diamines 2. The latter were submitted to the nonoxidative Pummerer reaction (NOPR) in CH2Cl2, that produced the target compounds 1 in very good yields with inversion Of Configuration. In some cases, the use of acetonitrile as solvent resulted in a double-inversion pathway, leading for example to the oxazolidinone 5. The total synthesis of an epimer of Saquinavir has been achieved by this method. (C) 2004 Elsevier Ltd. All rights reserved.