[EN] A PROCESS FOR INDUSTRIAL PREPARATION OF [(S)-N-TERT BUTOXYCARBONYL-3-HYDROXY]ADAMANTYLGLYCINE [FR] PROCÉDÉ DE PRÉPARATION INDUSTRIELLE DE LA [(S)-N-TERT BUTOXYCARBONYL-3-HYDROXY]ADAMANTYLGLYCINE
Rapid Asymmetric Synthesis of Disubstituted Allenes by Coupling of Flow-Generated Diazo Compounds and Propargylated Amines
作者:Jian-Siang Poh、Szabolcs Makai、Timo von Keutz、Duc N. Tran、Claudio Battilocchio、Patrick Pasau、Steven V. Ley
DOI:10.1002/anie.201611067
日期:2017.2.6
We report herein the asymmetric coupling of flow‐generated unstabilized diazo compounds and propargylated amine derivatives, using a new pyridinebis(imidazoline) ligand, a copper catalyst and base. The reaction proceeds rapidly, generating chiral allenes in 10–20 minutes with high enantioselectivity (89–98 % de/ee), moderate yields and a wide functional group tolerance.
[EN] PROCESS FOR PREPARING SAXAGLIPTIN AND ITS NOVEL INTERMEDIATES USEFUL IN THE SYNTHESIS THEREOF<br/>[FR] PROCÉDÉ DE PRÉPARATION DE SAXAGLIPTINE ET DE SES NOUVEAUX INTERMÉDIAIRES UTILES DANS SA SYNTHÈSE
申请人:APICORE LLC
公开号:WO2012162507A1
公开(公告)日:2012-11-29
Methods of making saxagliptin, pharmaceutically acceptable salts and hydrates thereof and intermediates thereof.
Synthesis of Adamantylglycine Using a Diastereoselective Grignard-to-Nitrone Addition
作者:Volker Jäger、Alevtina Baskakova、Wolfgang Frey
DOI:10.1055/s-0030-1258235
日期:2010.11
tert-leucine, adamantylglycine has so far received little attention. Here, a new, practical synthesis of adamantylglycine is described. This is based on a highly diastereoselective addition of adamantyl Grignardreagent to 2,3-O-cyclohexylideneglyceraldehyde N-benzylnitrone, mediated by the Lewis acid diethylaluminum chloride. Adamantylglycine is obtained from the nitrone in 6 steps and 28% yield as
intermolecular benzylic C(sp3)−H amination has been developed by combining the pentafluorobenzyl sulfamate PfbsNH2 with the chiral rhodium(II) catalyst Rh2(S‐tfptad)4. Various substrates can be used as limiting components and converted to benzylic amines with excellent yields and high levels of enantioselectivity. Additional key features for the reaction are the low catalyst loading and the ability
Cobalt-mediated alkylation of (4R) and (4S)-3-acetoacetyl-4-benzyloxazolidin-2-ones. Preparation of enantiopure diphenylmethyl-, 9-fluorenyl- and (1-adamantyl)glycines
The Co(II) complexes of (4R) and (4S)-3-acetoacetyl-4-benzyloxazolidin-2-ones are alkylated diastereoselectively with diphenylmethyl, 9-fluorenyl, and 1-adamantyl bromide. The resulting products are converted into enantiopure α-substituted glycines. Similar results are obtained by alkylation of the free acetoacetyloxazolidinones under Co(II)-catalysis.