A group of diastereopure α-benzotriazolyl 1-azacycloalka[2,1-b][1,3]oxazines were prepared from non-racemic Betti base and they were employed as the versatile precursors for the preparation of chiral ligands and chiral substituted azacyclics with significant advantages in the stereoselectivity.
An improved synthesis of chiral 1-[α-(1-azacycloalkyl)benzyl]-2-naphthols
作者:Xuenong Xu、Jun Lu、Yanmei Dong、Rui Li、Zongming Ge、Yuefei Hu
DOI:10.1016/j.tetasy.2003.12.025
日期:2004.2
An improved synthesis of homochiral 1-[alpha-(1-azacycloalkyl)benzyl]-2-naphthols and 1-[alpha-(2-arylpiperidyl)benzyl]-2-naphthols has been achieved by employing diastereomerically pure alpha-benzotriazolyl 1-azacycloalka[2,1-b][1,3]oxazines as homochiral precursors, which were obtained by condensation between nonracemic Betti base and dialdehydes in the presence of benzotriazole. (C) 2003 Elsevier Ltd. All rights reserved.