Diastereoselective synthesis of trans-trifluoromethyl-β-lactams and α-alkyl-β-trifluoromethyl-β-amino esters
摘要:
The diastereoselective synthesis of beta-lactams was examined from N-tosyl-1-chloro-2,2,2-trifluoroethylamine 3 and various nonactivated aliphatic acid chlorides in the presence of a Bronsted base. The mild reaction conditions allowed to get trifluoromethyl-beta-lactams in good yields with high trans-diastereo selectivity. In addition, we also demonstrated that ring-opening of beta-lactams easily provided alpha-alkyl-beta-trifluoromethyl-beta-amino esters. (C) 2011 Elsevier Ltd. All rights reserved.
Diastereoselective synthesis of trans-trifluoromethyl-β-lactams and α-alkyl-β-trifluoromethyl-β-amino esters
摘要:
The diastereoselective synthesis of beta-lactams was examined from N-tosyl-1-chloro-2,2,2-trifluoroethylamine 3 and various nonactivated aliphatic acid chlorides in the presence of a Bronsted base. The mild reaction conditions allowed to get trifluoromethyl-beta-lactams in good yields with high trans-diastereo selectivity. In addition, we also demonstrated that ring-opening of beta-lactams easily provided alpha-alkyl-beta-trifluoromethyl-beta-amino esters. (C) 2011 Elsevier Ltd. All rights reserved.
The diastereoselective synthesis of beta-lactams was examined from N-tosyl-1-chloro-2,2,2-trifluoroethylamine 3 and various nonactivated aliphatic acid chlorides in the presence of a Bronsted base. The mild reaction conditions allowed to get trifluoromethyl-beta-lactams in good yields with high trans-diastereo selectivity. In addition, we also demonstrated that ring-opening of beta-lactams easily provided alpha-alkyl-beta-trifluoromethyl-beta-amino esters. (C) 2011 Elsevier Ltd. All rights reserved.