Brønsted acid catalysed chemo- and <i>ortho</i>-selective aminomethylation of phenol
作者:Zhiqiong Tang、Dongdong Li、Yidi Yue、Dan Peng、Lu Liu
DOI:10.1039/d1ob00820j
日期:——
We have developed a Brønsted acidcatalysed highly ortho-selective functionalization of free phenols with readily available N,O-acetals under mild conditions, furnishing various corresponding aminomethylated phenol products in moderate to excellent yields. The salient features of this transformation include mild conditions, good substrate scope, excellent ortho-selectivity, high efficiency, and ease
ORGANIC ELECTRONIC MATERIAL, POLYMERIZATION INITIATOR AND THERMAL POLYMERIZATION INITIATOR, INK COMPOSITION, ORGANIC THIN FILM AND PRODUCTION METHOD FOR SAME, ORGANIC ELECTRONIC ELEMENT, ORGANIC ELECTROLUMINESCENT ELEMENT, LIGHTING DEVICE, DISPLAY ELEMENT, AND DISPLAY DEVICE
申请人:Ishitsuka Kenichi
公开号:US20130037753A1
公开(公告)日:2013-02-14
Disclosed is an organic electronic material comprising charge transporting compounds and ionic compounds having electron-accepting properties and high solubility in a solvent. The organic electronic material is characterized by comprising charge transporting compounds and ionic compounds, and in that at least one of the ionic compounds is any one kind of compounds represented by general formulas (1b)-(3b). (In the formulas Y
1
-Y
6
each independently represent a divalent linking group, R
1
-R
6
each independently represent an electron-attracting organic substituent (these structures can further have substituents and hetero-atoms, and R
1
, R
2
and R
3
, or, R
4
-R
6
can respectively combine and become a ring shape or a polymer shape) and L
+
represents a monovalent cation.)
Practical Synthesis of Natural
Amino Acid Derivatives: Hf(OTf)<sub>4</sub>-Catalyzed Mannich-Type
Reaction of Ketene Silyl Acetals or Enol Silyl Ethers with <i>N</i>,<i>O</i>-Acetals
as a Glycine Cation Equivalent
作者:Norio Sakai、Asuka Sato、Takeo Konakahara
DOI:10.1055/s-0029-1216743
日期:——
The authors demonstrated the Hf(OTf) 4 -catalyzed Mannich-type reaction of an enol silyl ether and a ketene silyl acetal with an N,O-acetat leading to the preparation of amino acid derivatives. In particular, use of the N,O-acetal having a bis(trimethylsilyl)amino group directly produced N-unprotected aspartic acid derivatives after a standard aqueous workup.
A new and efficient cyclization reaction has been developed to synthesize cyclic α,α‐disubstituted β‐amino esters via iron‐catalyzed intramolecular aminomethyloxygenative cyclization of diazo compounds with N,O‐aminal under mild reaction conditions. A broad range of hydroxy‐α‐diazoesters with different substituents and various N,O‐aminals were compatible with this protocol, affording the corresponding
CONCISE BETA2-AMINO ACID SYNTHESIS VIA ORGANOCATALYTIC AMINOMETHYLATION
申请人:CHI Yonggui
公开号:US20080058548A1
公开(公告)日:2008-03-06
The present invention provides a method for the synthesis of β
2
-amino acids. The method also provides methods yielding α-substituted β-amino aldehydes and β-substituted γ-amino alcohols. The present method according to this invention allows for increased yield and easier purification using minimal chromatography or crystallization. The methods described herein are based on an aldehyde aminomethylation which involves a Mannich reaction between an aldehyde and a formaldehyde-derived N,O-acetal (iminium precursor) and a catalyst, such as, for example, L-proline or a pyrrolidine. The invention allows for large scale, commercial preparation of β
2
-amino acids.