Formal Synthesis of Tamiflu: Conversion of Tamiflu into Tamiphosphor
作者:Dinara Gunasekera
DOI:10.1055/s-0031-1290356
日期:2012.3
synthesis of Shibasaki’s 3rd generation intermediate to form (-)-oseltamivir phosphate (Tamiflu®) has been achieved in eight steps with the use of inexpensive starting materials. A formal synthetic route to convert tamiflu into tamiphosphor via Fang’s tamiphosphor intermediate has been accomplished. hydrolysis - epoxide - oxidation - amides - enantioselectivity
Asymmetric Desymmetrization of 4,5-Epoxycyclohex-1-ene by Enantioselective Allylic Oxidation
作者:Qitao Tan、Masahiko Hayashi
DOI:10.1021/ol901284v
日期:2009.8.6
Asymmetric desymmetrization of allylic oxidation of 4,5-epoxycyclohex-1-ene (1) took place in the presence of 2.5 mol % of Cu(CH3CN)4PF6 and 3 mol % of chiral N,N-bidentate ligand (S)-2 to afford (3S,4S,5S)-3-benzoyloxy-4,5-epoxycyclohex-1-ene (3) in 84% ee, which was increased up to >99% ee after recrystallization of 3-4′-nitrobenzoyloxy derivative 6. Optically pure 6 proved to be a key intermediate
We have accomplished the asymmetric synthesis of (8S,9S,10R,6Z)-trihydroxyoctadec-6-enoic acid in optically pure form and determined the absolute configuration of the natural product on the basis of the stereodetermined chiral building block 7, which was prepared by the catalytic enantioselective allylic oxidation of 4,5-epoxycyclohex-1-ene using an S-configured N,N-bidentate ligand–copper catalyst
A facile and short synthesis of (1S,5R,6S)-5-azido-6-benzyloxycyclohex-2-en-1-ol (1) has been achieved in high yield starting from 4,5-epoxycyclohex-1-ene by using a catalytic asymmetric allylic oxidation reaction. (C) 2010 Elsevier Ltd. All rights reserved.