Stereoselective Synthesis of 1,2-<i>trans</i>
-Diamines Using the Three-Component Borono-Mannich Condensation - Reaction Scope and Mechanistic Insights
作者:Stéphanie Norsikian、Margaux Beretta、Alexandre Cannillo、Marie Auvray、Amélie Martin、Pascal Retailleau、Bogdan I. Iorga、Jean-Marie Beau
DOI:10.1002/ejoc.201700089
日期:2017.4.10
N‐Nosylated α‐amino aldehydes generate 1,2‐trans‐diamines diastereoselectively with an enantiomeric excess of up to 98 % through the Petasis borono‐Mannich three‐component condensation.
Ligand-Enabled γ-C(sp<sup>3</sup>)–H Cross-Coupling of Nosyl-Protected Amines with Aryl- and Alkylboron Reagents
作者:Qian Shao、Jian He、Qing-Feng Wu、Jin-Quan Yu
DOI:10.1021/acscatal.7b02721
日期:2017.11.3
Pd(II)-catalyzed γ-C(sp3)–H cross-coupling of 4-nitrobenzenesulfonyl (Ns)-protected amines is realized using both arylboron and alkylboron coupling partners. An acetyl-protected aminomethyl oxazoline (APAO) ligand is found to enable the C(sp3)–H arylation reaction, whereas mono-N-protected amino acid (MPAA) ligands promote the C(sp3)–H cross-coupling with various alkylboron reagents. Notably, the APAO-promoted
Synthesis of novel N-protected β3-amino nitriles: study of their hydrolysis involving a nitrilase-catalyzed step
作者:Maité Sylla-Iyarreta Veitía、Pierre Louis Brun、Pierre Jorda、Annie Falguières、Clotilde Ferroud
DOI:10.1016/j.tetasy.2009.07.045
日期:2009.9
Several commercially available nitrilases were investigated with regard to their potential to hydrolyze N-protected beta(3)-amino nitriles into their corresponding N-protected beta(3)-amino acids.The biotransformations were obtained in different proportions depending oil the nitrilase involved The best hydrolysis results were achieved for the N-Cbz-beta(3)-amino nitrile from i-alanine using the NIT-107, in a phosphate buffer at 0 05 M However, no biotransformation into the corresponding acids was observed for the N-sulfonylamide beta(3)-amino nitriles. Two simple and efficient procedures to prepare the beta(3)-amino nitriles from their analogous alpha-amino acids are described Thirty four new substances were synthesized and characterized over the course of this work. (C) 2009 Elsevier Ltd All rights reserved
Synthesis of enantioenriched 1,2-trans-diamines using the borono-Mannich reaction with N-protected α-amino aldehydes
The three-component Petasis borono-Mannich reaction starting with easily accessible N-protected α-amino aldehydes produces efficiently and diastereoselectively 1,2-trans-diamines with an enantiomeric excess of up to 98%.