Identification of the best-suited leaving group for the diastereoselective synthesis of glycidic amides from stabilised ammonium ylides and aldehydes
作者:Richard Herchl、Martin Stiftinger、Mario Waser
DOI:10.1039/c1ob05721a
日期:——
In comparison to the use of sulfur ylides, the use of ammonium ylides for the synthesis of epoxides is significantly less developed. As a part of our systematic investigations concerning the use of amide-stabilised ammonium ylides for the synthesis of glycidic amides we have focused on the identification of the best-suited amino leaving group for this purpose. Whereas tertiary amines like quinuclidine
Enantioselective Spirocyclopropanation of <i>para</i>-Quinone Methides Using Ammonium Ylides
作者:Lukas Roiser、Mario Waser
DOI:10.1021/acs.orglett.7b00869
日期:2017.5.5
The use of Cinchonaalkaloid-based chiral ammonium ylides allows for the first highlyenantioselective and broadly applicable spirocyclopropanation reactions of para-quinone methides. This strategy provides a straightforward protocol toward the chiral spiro[2.5]octa-4,7-dien-6-one skeleton, which is a frequently found structural motif in important biologically active molecules.
Synthesis of [2.2]Paracyclophane‐Based Glycidic Amides Using Chiral Ammonium Ylides
作者:David Weinzierl、Mario Waser
DOI:10.1002/hlca.202100073
日期:2021.7
An ammonium ylide-mediated stereoselective protocol for the synthesis of a series of novel [2.2]paracyclophane-based epoxides starting from racemic 4-formyl[2.2]paracyclophane has been developed. By using achiral ammonium salts as ylide precursors, the corresponding epoxide products were obtained in isolated yields up to 76 % and with diastereoselectivities up to d.r.=9 : 1. When carrying out the reaction