The synthesis of trans -carbovir via the ramberg-bäcklund reaction
摘要:
A novel Ramberg-Backlund approach to the synthesis of 1-amino-4-substituted cyclopentenes is described and applied to prepare the trans-isomer of the carbocyclic nucleoside carbovir.
Palladium(0)/indium iodide-mediated allylations of electrophiles generated from the hydrolysis of Eschenmoser’s salt: one-pot preparation of diverse carbocyclic scaffolds
作者:Cara Cesario、Marvin J. Miller
DOI:10.1016/j.tetlet.2010.04.007
日期:2010.6
A formyl equivalent was generated in situ from Eschenmoser's salt in aqueous THF and was reacted with an allylindium species. Acylnitroso-derived hetero-Diels-Alder adducts and related allyl acetates were shown to be substrates for Pd(0)/InI-mediated allylations of formaldehyde-related species to provide homoallylic alcohols. Hydroxymethyl groups were installed with regio- and diastereocontrol to provide relevant disubstituted carbocyclic scaffolds. Enantiopure anti-disubstituted cyclopentene products were prepared from a chiral allyl acetate. (C) 2010 Elsevier Ltd. All rights reserved.