The Sharpless asymmetric aminohydroxylation reaction: optimising ligand/substrate control of regioselectivity for the synthesis of 3- and 4-aminosugars
作者:Jennifer A. Bodkin、George B. Bacskay、Malcolm D. McLeod
DOI:10.1039/b803310b
日期:——
regioselectivity in the Sharplessasymmetric aminohydroxylation (AA) has been conducted. Theoretical investigations of ligand-osmium binding geometry and experimental investigations of the Sharpless AA reaction on a series of functionalized pent-2-enoic acid ester substrates demonstrate that the opposite regioselectivity afforded using PHAL and AQN ligands results from a change in substrate orientation with
Tandem olefin metathesis–elimination reactions. A new route to doubly unsaturated carbonyl derivatives
作者:Bruce H. Lipshutz、Subir Ghorai、Žarko V. Bošković
DOI:10.1016/j.tet.2008.04.027
日期:2008.7
Cross-metathesis between an activated olefin and an ethereal derivative of homoallylic alcohols leads to products that are subject to facile elimination resulting in α,β,γ,δ-unsaturated esters, ketones, acids, and aldehydes in high yields.