Enantioselective Addition of Bromonitromethane to Aliphatic <i>N</i>-Boc Aldimines Using a Homogeneous Bifunctional Chiral Organocatalyst
作者:Kenneth E. Schwieter、Jeffrey N. Johnston
DOI:10.1021/acscatal.5b01901
日期:2015.11.6
This report details the enantioselectivesynthesis of β-amino-α-bromo nitroalkanes with β-alkyl substituents, using homogeneous catalysis to prepare either antipode. Use of a bifunctionalBrønstedbase/acid catalyst allows equal access to either enantiomer of the products, enabling the use of Umpolung Amide Synthesis (UmAS) to prepare the corresponding L- or D-α-amino amide bearing alkyl side chains—overall
Enantioselective synthesis of <scp>d</scp>-α-amino amides from aliphatic aldehydes
作者:Kenneth E. Schwieter、Jeffrey N. Johnston
DOI:10.1039/c5sc00064e
日期:——
Bromonitromethane is used in a phase transfer-catalysed enantioselective aza-Henry reaction, leading to D-amino amide bearing an alkyl chain.
溴硝基甲烷用于相转移催化的对映选择性氮杂-亨利反应,生成带有烷基链的 D-氨基酰胺。
Phase Transfer Catalyzed Enantioselective Strecker Reactions of α-Amido Sulfones with Cyanohydrins
作者:Raquel P. Herrera、Valentina Sgarzani、Luca Bernardi、Francesco Fini、Daniel Pettersen、Alfredo Ricci
DOI:10.1021/jo061566u
日期:2006.12.1
A study into the use of a chiral phase-transfer catalyst in conjunction with acetone cyanohydrin to effect the enantioselective formation of α-amino nitriles from α-amido sulfones is described. This novel catalytic asymmetric Streckerreaction is analyzed with regard to the possible mechanistic basis.
One-Pot Synthesis of α-Amino Acids from CO<sub>2</sub> Using a Bismetal Reagent with Si–B Bond
作者:Tsuyoshi Mita、Jianyang Chen、Masumi Sugawara、Yoshihiro Sato
DOI:10.1021/ol302952r
日期:2012.12.21
TsOH·H2O, precursors of N-Boc-imines can be converted into the corresponding α-aryl or α-alkenyl glycine derivatives under gaseous CO2 in moderate-to-high yields with a single operation. α-Isobutenyl glycine thus obtained can be further derivatized into various types of α-aminoacids including N-Boc-leucine, serine, and glycine derivatives in short steps.
The unprecedented use of phase-transfer catalysis (PTC) in an asymmetric hydrophosphonylation reaction allows the obtainment of a range of optically active α-amino phosphonic acid derivatives directly from α-amido sulfones.