Doubly diastereoselective conjugate additions of the antipodes of lithium N-benzyl-N-(α-methylbenzyl)amide to enantiopure ε-O-protected α,β-unsaturated esters derived from d-ribose
作者:Stephen G. Davies、Emma M. Foster、James A. Lee、Paul M. Roberts、James E. Thomson
DOI:10.1016/j.tetasy.2014.02.004
日期:2014.4
ε-O-benzyloxy-α,β-unsaturatedesters derived from d-ribose, each containing a cis-dioxolane unit, display excellent (⩾95:5 dr) levels of diastereofacial directing ability upon conjugateaddition of achiral lithium N-benzyl-N-isopropylamide. In contrast to the corresponding enantiopure ε-O-silyloxy-α,β-unsaturatedester derived from l-tartaric acid, which contains a trans-dioxolane unit, the conjugate additions
Rhodium(<scp>ii</scp>)-catalysed tandem aziridination and ring-opening: stereoselective synthesis of functionalised tetrahydrofurans
作者:William P. Unsworth、Nicola Clark、Thomas O. Ronson、Kiri Stevens、Amber L. Thompson、Scott G. Lamont、Jeremy Robertson
DOI:10.1039/c4cc05159a
日期:——
Rh(ii) mediated tandem aziridination and cycloetherification achieves a direct, stereoselective synthesis of the 2-(1-amino-2-hydroxyethyl)tetrahydrofuran motif.