Asymmetric total synthesis of natural diheteropeptin
摘要:
A total asymmetric synthesis of diheteropeptin and a stereomer from the known (E)-1-iodo-6-octene, using the Schollkopf method for amino acid synthesis and Sharpless asymmetric dihydroxylation as key steps, is described. The asymmetric synthesis of a new unsaturated amino acid is also described. (C) 2001 Elsevier Science Ltd. All rights reserved.
Terminal acetylenes are amongst the most problematic substrates for alkynemetathesis because they tend to undergo rapid polymerization on contact with a metal alkylidyne. The molybdenum complex 3 endowed with triphenylsilanolate ligands, however, is capable of inducing surprisingly effective cross‐metathesis reactions of terminal alkyl acetylenes with propynyl(trimethyl)silane to give products of
Capsaicin derivates and the production and use thereof
申请人:Helsing Torsten
公开号:US20070167524A1
公开(公告)日:2007-07-19
The invention relates to new compounds, namely capsaicin derivates, a new method for their production, and their use as micro-organism-repellent agents in paints and coatings, in particular for marine installations and ships, but also for land-based structures.
Mild Niobium-Catalyzed [2 + 2 + 2] Cycloaddition of Sila-triynes: Easy Access to Polysubstituted Benzosilacyclobutenes
作者:Cédric Simon、Muriel Amatore、Corinne Aubert、Marc Petit
DOI:10.1021/ol503663k
日期:2015.2.20
A new and efficient synthesis of highly sensitive benzosilacyclobutenes has been developed. For the first time, these compounds can be synthesized in very high yields by a mild, unprecedented intramolecular niobium-catalyzed [2 + 2 + 2] cycloaddition of easily accessible tetrasubstituted sila-triynes. An easy access to highly functionalized benzosilacyclobutenes enlarging the number of potential applications in organic and material chemistry is described.