Enantioselective synthesis of N,O-psiconucleosides
摘要:
The first enantioselective synthesis Of beta-D and beta-L N,O-psiconucleosides is reported. The synthetic approach is based on the asymmetric 1.3-dipolar cycloaddition of the C-[(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]-N-methyl nitrone with ethyl 2-acetyl-oxyacrylate followed by Vorbruggen nucleosidation, and removal of the chiral auxiliary. Stereochemical assignments are supported by a DFT theoretical study of the cycloaddition reaction. (C) 2003 Elsevier Ltd. All rights reserved.
Enantioselective synthesis of N,O-psiconucleosides
摘要:
The first enantioselective synthesis Of beta-D and beta-L N,O-psiconucleosides is reported. The synthetic approach is based on the asymmetric 1.3-dipolar cycloaddition of the C-[(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]-N-methyl nitrone with ethyl 2-acetyl-oxyacrylate followed by Vorbruggen nucleosidation, and removal of the chiral auxiliary. Stereochemical assignments are supported by a DFT theoretical study of the cycloaddition reaction. (C) 2003 Elsevier Ltd. All rights reserved.