Chemoselective reduction of pyrimidines. An access to enantiopure tetrahydropyrimidinones
摘要:
A synthesis of substituted 1,3-tetrahydropyrimidinones 8 starting from homochiral synthon 2 is described. Chemoselective reduction of pyrimidines 4 using BH3-THF provides an access to regioselective N-protected tetrahydropyrimidinones 8. (C) 2001 Elsevier Science Ltd. All rights reserved.
Enantioselective synthesis of α,β-substituted β-amino acids
摘要:
Chiral derivative 3 was shown to be a precursor of alpha and beta -substituted beta -amino acids as well as alpha,beta -disubstituted beta -amino acids. The key steps of the procedure are a diastereoselective alkylation of synthon 3 by organocuprates reagents and a diastereoselective alkylation of the: alkylated adduct. (C) 2000 Elsevier Science Ltd. All rights reserved.