Highly chemoselective reactions on hindered sulfamidates with oxygenated nucleophiles
摘要:
Although the chemoselectivity problems in substitution reactions, which arise from the use of oxygenated nucleophiles in a basic medium by generating anionic species are well-known, we report herein a highly chemoselective ring-opening reaction of hindered cyclic sulfamidates with O-nucleophiles. The reaction occurs with the inversion of configuration at the quaternary centre, allowing the stereoselective synthesis of an important class of beta(2,2)-amino acids, namely O-substituted alpha-methylisoserines. (C) 2008 Elsevier Ltd. All rights reserved.
Highly chemoselective reactions on hindered sulfamidates with oxygenated nucleophiles
摘要:
Although the chemoselectivity problems in substitution reactions, which arise from the use of oxygenated nucleophiles in a basic medium by generating anionic species are well-known, we report herein a highly chemoselective ring-opening reaction of hindered cyclic sulfamidates with O-nucleophiles. The reaction occurs with the inversion of configuration at the quaternary centre, allowing the stereoselective synthesis of an important class of beta(2,2)-amino acids, namely O-substituted alpha-methylisoserines. (C) 2008 Elsevier Ltd. All rights reserved.