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.
Asymmetric Synthesis of α-Fluoro-β-Amino-oxindoles with Tetrasubstituted C–F Stereogenic Centers via Cooperative Cation-Binding Catalysis
作者:Sushovan Paladhi、Sang Yeon Park、Jung Woon Yang、Choong Eui Song
DOI:10.1021/acs.orglett.7b02628
日期:2017.10.6
Biologically relevant chiral 3,3-disubstituted oxindole products containing a β-fluoroamine unit are obtained in high yields and with excellent stereoselectivity (up to 99% ee, dr >20:1 for syn) through the organocatalytic direct Mannichreaction of 3-fluoro-oxindoles as fluoroenolate precursors and α-amidosulfones as the bench-stable precursors of sensitive imines by using a chiral oligoethylene glycol
A fluorinated valine derivative was designed and synthesized using an asymmetric catalytic C–C bond forming reaction as the key synthetic step. Its conformations and physicochemical properties were studied by a combination of experimental and computational methods.
Enantioselective Synthesis of Chiral 2‐Nitroallylic Amines via Cooperative Cation‐Binding Catalysis
作者:Jin Hyun Park、Pintu Maity、Sushovan Paladhi、Han Yong Bae、Choong Eui Song
DOI:10.1002/chem.202301787
日期:2023.9.15
cooperative cation-binding catalysis as an efficient method for synthesizing chiral allylic amines. By utilizing a chiral oligoEG and potassium fluoride as a cation-binding catalyst and base, respectively, a wide range of biologically relevant chiral 2-nitroallylic amines are obtained with excellent enantioselectivities (up to >99 % ee) through the organocatalytic asymmetric aza-Henry-like reaction of β-monosubstituted
在这项研究中,我们提出使用协同阳离子结合催化作为合成手性烯丙胺的有效方法。通过使用手性寡聚乙二醇和氟化钾分别作为阳离子结合催化剂和碱,通过有机催化不对称氮杂亨利获得了各种具有优异对映选择性(高达 >99 % ee )的生物学相关手性 2-硝基烯丙基 胺β-单取代和β,β-二取代硝基烯烃与α-酰胺基砜作为亚胺前体的类反应。手性2-硝基烯丙基胺作为迈克尔受体的初步使用证明了其在生物活性化合物的多样性合成中的潜在应用。
Disulfonimide-Catalyzed Asymmetric Synthesis of β<sup>3</sup>-Amino Esters Directly from <i>N</i>-Boc-Amino Sulfones
作者:Qinggang Wang、Markus Leutzsch、Manuel van Gemmeren、Benjamin List
DOI:10.1021/ja408747m
日期:2013.10.16
An asymmetric Mannich reaction of silyl ketene acetals with N-Boc-amino sulfones has been developed. A chiral disulfonirnide efficiently catalyzes both the in situ generation of the corresponding N-Boc imines and the asymmetric Mannich reaction with excellent yields and enantioselectivities. Kinetic studies confirm a proposed stepwise mechanism.