Asymmetric synthesis of α- and β-amino acids by diastereoselective addition of triorganozincates to N-(tert-butanesulfinyl)imines
摘要:
The diastereoselective addition of triorganozincates to (R)-N-(tert-butanesulfinyl)imines has been used as a key step to achieve the synthesis of highly enantiomerically enriched N-protected alpha- and beta-amino acids. Desulfinylation of the addition products followed by benzoylation of the nitrogen atom of the obtained primary amines and oxidation of one of the substituents on the carbon atom connected to the nitrogen complete the sequence. Using the same configuration in the sulfinyl chiral auxiliary, alpha-amino acids with the (R) or the (S) configuration can be prepared by choosing the proper combination of imine and organozincate. alpha,alpha-Disubstituted alpha-amino esters with high enantiomeric purity can also be prepared when a-imino esters are the starting substrates. (C) 2010 Elsevier Ltd. All rights reserved.
Phosphoramidite ligand and production method of allylic amine using the same
申请人:Sumitomo Chemical Company, Limited
公开号:US07863443B2
公开(公告)日:2011-01-04
The present invention provides a production method of an allylic amine represented by the formula (III):
wherein R3 is as defined in the specification,
which comprises reacting by an allylic alcohol represented by the formula (II):
wherein R3 is as defined in the specification,
with sulfamic acid, in the presence of a phosphoramidite ligand represented by the formula (I):
wherein each symbol is as defined in the specification, and an iridium complex. According to the present invention, a primary allylic amine can be produced directly from an allylic alcohol, without use of an activator for an allylic alcohol and conversion of an allylic alcohol into an activated compound thereof.