Perhydro-1,3-benzoxazines derived from (−)-8-aminomenthol as ligands for the catalytic enantioselective addition of diethylzinc to aldehydes
作者:Celia Andrés、Rebeca Infante、Javier Nieto
DOI:10.1016/j.tetasy.2010.07.016
日期:2010.9
The catalytic potency of a series of perhydro-1,3-benzoxazines prepared from (−)-8-aminomenthol was examined in the enantioselective addition of diethylzinc to aldehydes. When (2R,3S,3aS,4aR,6R,8aS)-2-isopropyl-6,9,9-trimethyl-3-phenyldecahydro-4aH-pyrrolo[2,1-b][1,3]benzoxazin-3-ol 7b was used as a chiral ligand, 1-substituted propanols with an (R)-configuration were obtained in high yields and enantiomeric
Diastereoselective Yang Photocyclization Reactions in Solution. Synthesis of Enantiopure Azetidin-3-ol Derivatives
作者:Rafael Pedrosa、Celia Andrés、Javier Nieto、Soledad del Pozo
DOI:10.1021/jo0481497
日期:2005.2.1
Chiral 2-acyl-3-allyl- or 2-acyl-3-benzyl-substituted perhydro-1,3-benzoxazines readily cyclized under irradiation to azetidin-3-ol derivatives. The diastereoselectivity of the cyclization is dependent on the nature of the substituents at the nitrogen atom. N-allyl-substituted derivatives yielded only two of the four possible diastereomers in moderate to good diastereomeric excess. The cyclization