Herein, we report the first example of group transfer radical addition of O-vinylhydroxylamine derivatives onto unactivatedalkenes. By utilizing O-vinylhydroxylamine derivatives as both the N- and C-donors, this reaction enables intermolecular carboamination of unactivatedalkenes in an atom economical fashion. As the process is initiated through N-radical addition followed by C-transfer, linear carboamination
在此,我们报告了第一个将 O-乙烯基羟胺衍生物基团转移自由基加成到未活化烯烃上的例子。通过使用 O-乙烯基羟胺衍生物作为 N 和 C 供体,该反应能够以原子经济的方式对未活化的烯烃进行分子间碳胺化。由于该过程是通过 N-自由基加成和 C-转移引发的,因此提供了线性碳胺化产物。这与烯烃的经典自由基碳官能化不同,后者通常有利于支链产物,因为它是由 C-自由基加成引发的。
Process for producing optically active compound
申请人:Tokunaga Makoto
公开号:US20060173210A1
公开(公告)日:2006-08-03
A process for producing an optically active compound based on the hydrolysis of an alkenyl ester compound or the cleavage of an alkenyl ether compound. The process uses neither an acidic compound nor a basic compound, and rectants can be reacted in a high concentration. It does not necessitate a buffer, nutrient, etc. unlike enzymatic reactions or reactions using a microorganism. It is a simple process which attains a satisfactory production efficiency. The process, which is for producing an optically active carboxylic acid or optically active alcohol represented by the general formula (VI): (wherein R
1
, R
2
, and R
3
are different groups; and A represents methylene, carbonyl, or a single bound), is characterized by causing water to act on an alkenyl ester or alkenyl ether represented by the general formula (I): (wherein R
4
, R
5
, and R
6
each represents hydrogen, alkyl, etc.) in the presence of a specific transition metal complex having an optically active ligand.
Process for making an optically active mixture of an n-acyl-amino acid or ester containing at least two chiral centers
申请人:THE STANDARD OIL COMPANY
公开号:EP0413068A1
公开(公告)日:1991-02-20
In the process of hydrocarboxylating an α-enamide with CO and H₂O or an organic hydroxyl compound to produce an N-acyl-α-amino acid or ester, respectively, the improvement comprising using as the α-enamide reactant, an α-enamide which has a chiral center that is essentially all L or D, thereby producing a reaction mixture containing diastereomeric N-acyl-α-amino acids or esters having two chiral centers, said mixture having essentially no enantiomeric pairs.
A process produces vinyl ether compounds and includes allowing a vinyl ester compound represented by following Formula (1):
1
wherein R
1
, R
2
, R
3
and R
4
are the same or different and are each a hydrogen atom or an organic group, to react with a hydroxy compound represented by following Formula (2):
R
5
OH (2)
wherein R
5
is an organic group, in the presence of at least one transition element compound to thereby yield a vinyl ether compound represented by following Formula (3):
2
wherein R
2
, R
3
, R
4
and R
5
have the same meanings as defined above. Such transition element compounds include iridium compounds and other compounds containing Group VIII elements.
A library of pyranocoumarin derivatives<i>via</i>a one-pot three-component hetero diels-alder reaction
作者:Giancarlo Cravotto、Gian Mario Nano、Silvia Tagliapietra、Giovanni Palmisano、Tullio Pilati
DOI:10.1002/jhet.5570380425
日期:2001.7
A heteroDiels-Alderreaction with inverse electron demand between 4-hydroxycoumarin, aromatic aldehydes and electron-rich alkenes yielded a multitude of 2,4-disubstituted 3,4-dihydropyranocoumarins. This route opened an easy access to coumarin anticoagulants and provided a library of pyranocoumarin derivatives.