Stereocontrolled entry to β-C-glycosides and bis-C,C-glycosides from C-glycals: preparation of a highly functionalized triene from d-mannose
摘要:
The C(3) hydroxyl group of C-glycals can be readily converted into mixed halo-acetals of 2-bromo-acetaldehyde. Radical reaction of the latter mediated by tri-n-butyltin hydride, with or without a radical acceptor, led diastereoselectively to either beta -C-glycosides or bis-C,C-glycosides, respectively. The latter have been transformed into a highly functionalized triene, which is a potential precursor in a proposed synthesis of labdane type diterpenes from D-mannose. (C) 2001 Elsevier Science Ltd. All rights reserved.
Stereocontrolled entry to β-C-glycosides and bis-C,C-glycosides from C-glycals: preparation of a highly functionalized triene from d-mannose
摘要:
The C(3) hydroxyl group of C-glycals can be readily converted into mixed halo-acetals of 2-bromo-acetaldehyde. Radical reaction of the latter mediated by tri-n-butyltin hydride, with or without a radical acceptor, led diastereoselectively to either beta -C-glycosides or bis-C,C-glycosides, respectively. The latter have been transformed into a highly functionalized triene, which is a potential precursor in a proposed synthesis of labdane type diterpenes from D-mannose. (C) 2001 Elsevier Science Ltd. All rights reserved.
Synthesis of<i>C</i>-1 Alkyl and Aryl Glycals from Pyranosyl or Furanosyl Chlorides by Treatment with Organolithium Reagents
作者:Ana M. Gómez、Ana Pedregosa、Marta Casillas、Clara Uriel、J. Cristóbal López
DOI:10.1002/ejoc.200900417
日期:2009.7
Glycosyl chlorides, with ether or isopropylidene acetal protecting groups, readily available from furanoses or pyranoses, can be conveniently transformed into C-1 alkyl or aryl glycals by reaction with alkyl or aryl organolithiumreagents.
Expeditious entry to C-alkyl and C-aryl pyranoid glycals: reaction of anomeric glycosyl chlorides with organolithiums
作者:Ana M. Gómez、Marta Casillas、Serafín Valverde、J. Cristóbal López
DOI:10.1039/cc9960002357
日期:——
Treatment of ether-substituted glycopyranosyl chlorides with organolithium reagents gives the corresponding C-glycals in acceptable to good yields.
Stereocontrolled entry to β-C-glycosides and bis-C,C-glycosides from C-glycals: preparation of a highly functionalized triene from d-mannose
作者:Ana M. Gómez、Marta Casillas、Serafı́n Valverde、J.Cristóbal López
DOI:10.1016/s0957-4166(01)00363-9
日期:2001.8
The C(3) hydroxyl group of C-glycals can be readily converted into mixed halo-acetals of 2-bromo-acetaldehyde. Radical reaction of the latter mediated by tri-n-butyltin hydride, with or without a radical acceptor, led diastereoselectively to either beta -C-glycosides or bis-C,C-glycosides, respectively. The latter have been transformed into a highly functionalized triene, which is a potential precursor in a proposed synthesis of labdane type diterpenes from D-mannose. (C) 2001 Elsevier Science Ltd. All rights reserved.