Diastereoselective addition of vinylmagnesium halides to variously N-mono- and N,N-diprotected l-alaninals
摘要:
Diastereoselective C-2-elongation processes of N-mono- 1a-c and N,N-diprotected 1d-f L-alaninals, using vinylmagnesium bromide and chloride, are described. A substantial difference between effects of the N-protecting groups replacing either one or two amino protons was observed. (C) 1997 Elsevier Science Ltd. All rights reserved.
Imino Glycals via Ruthenium-Catalyzed RCM and Isomerization
作者:Bernd Schmidt、Sylvia Hauke、Nino Mühlenberg
DOI:10.1055/s-0033-1338615
日期:——
enamides via a ruthenium-catalyzed assisted tandem catalytic ring-closing metathesis–isomerization sequence. The sequence relies on the in situ transformation of a metathesis active Ru–carbene into an isomerization active Ru–hydride by addition of hydroxide as a chemical trigger. N-Allyl-N-homoallylamines were converted in one step into cyclic enamides via a ruthenium-catalyzed assisted tandem catalytic