A Synthetic Route to Highly Substituted 1,2,3,4-Tetrahydroisoquinolines via Yb(OTf)3-Catalyzed Diastereoselective Ring Opening of Bridged Oxazolidines: Asymmetric Synthesis of 2-Azapodophyllotoxin
作者:Ajay Kumar Srivastava、Minseob Koh、Seung Bum Park
DOI:10.1002/chem.201002938
日期:2011.4.18
aldehydes and transformed into fully functionalized THIQs viadiastereoselectiveringopening with various nucleophiles in the presence of Yb(OTf)3. This methodology furnished four out of eight possible diastereomers of 1,2,3,4‐tetrasubstituted THIQs despite the electronic nature of substituents on the aryl rings. Finally, the enantioselective synthesis of 2‐azapodophyllotoxin was achieved with an overall