ALVARO M.; BALDOVI V.; GARCIA H.; MIRANDA M. A.; PRIMO J., TETRAHEDRON LETT., 28,(1987) N 31, 3613-3614
摘要:
DOI:
作为产物:
描述:
乙酸异丙烯酯 、 ω-苄基苯乙酮 在
对甲苯磺酸 作用下,
以37%的产率得到enol acetate of 3-phenylpropiophenone
参考文献:
名称:
Direct photolysis and electron transfer photooxygenation of enol acetates of 3-phenylpropiophenones
摘要:
Direct photolysis of enol acetates of 3-phenylpropiophenones la-c gives rise to the parent propiophenones 2a-c and the 1,3-acyl shift products 3a-c. By contrast, 2,4,6-triphenylpyrylium tetrafluoroborate sensitized photolysis of substrates la-c affords the alpha-acetyloxypropiophenones 79-c as the most general products. These results have been rationalized according to the generation of radical pairs in the direct photolysis and radical cations in the photoinduced electron transfer processes.
Sulfoxide ligand metal catalyzed oxidation of olefins
申请人:The Board of Trustees of the University of Illinois
公开号:US10266503B1
公开(公告)日:2019-04-23
The enantioselective synthesis of isochroman motifs has been accomplished via Pd(II)-catalyzed allylic C—H oxidation from terminal olefin precursors. Critical to the success of this goal was the development and utilization of a novel chiral aryl sulfoxide-oxazoline (ArSOX) ligand. The allylic C—H oxidation reaction proceeds with the broadest scope and highest levels asymmetric induction reported to date (avg. 92% ee, 13 examples ≥90% ee). Additionally, C(sp3)-N fragment coupling reaction between abundant terminal olefins and N-triflyl protected aliphatic and aromatic amines via Pd(II)/sulfoxide (SOX) catalyzed intermolecular allylic C—H amination is disclosed. A range of 52 allylic amines are furnished in good yields (avg. 76%) and excellent regio- and stereoselectivity (avg. >20:1 linear:branched, >20:1 E:Z). For the first time, a variety of singly activated aromatic and aliphatic nitrogen nucleophiles, including ones with stereochemical elements, can be used in fragment coupling stiochiometries for intermolecular C—H amination reactions.
The present invention relates to novel P-chirogenic organophosphorus compounds of general formula (I). The present invention also provides a process for the synthesis of said compounds of formula (I). The present invention also relates to intermediate products of general formulae (II), (III) and (IV), as shown below, which are involved in the synthesis of compounds (I). Further, the invention relates to metal complexes comprising compounds (I) as ligands. The novel compounds and complexes of the present invention are useful in asymmetric catalysis by transition metal complexes or organocatalysis, especially for asymmetric hydrogenation or allylation. Compounds of general formula (I) may useful as agrochemical and therapeutic substances, or as reagents or intermediates for fine chemistry.
申请人:CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS)
公开号:US20140142325A1
公开(公告)日:2014-05-22
Novel P-chirogenic organophosphorus compounds of general formula (I), a process for the synthesis of the compounds of formula (I), and intermediate products of general formulae (II), (III) and (IV), as shown below, are involved in the synthesis of compounds (I).
Metal complexes including compounds (I) as ligands are also described. The novel compounds and complexes are useful in asymmetric catalysis by transition metal complexes or organocatalysis, especially for asymmetric hydrogenation or allylation. Compounds of general formula (I) may be useful as agrochemical and therapeutic substances, or as reagents or intermediates for fine chemistry.
CATALYST FOR ASYMMETRIC SYNTHESIS, LIGAND FOR USE THEREIN, AND PROCESS FOR PRODUCING OPTICALLY ACTIVE COMPOUND THROUGH ASYMMETRIC SYNTHESIS REACTION USING THEM
申请人:Japan Science and Technology Agency
公开号:EP1854802A1
公开(公告)日:2007-11-14
Compounds represented by the following general formula (1a) or (1b).
A complex comprising a center metal of rhodium and a compound represented by the following general formula (1a) or (1b) as a ligand. A catalyst for optically active beta-substituted carbonyl compound synthesis and catalyst for asymmetric 1, 2 addition reaction being composed of the complex. A method of production of an optically active beta-aryl compound from an alpha, beta-unsaturated compound and an aryl-boronic acid derivative and method of production of an optically active aryl alcohol compound from an aldehyde compound and aryl boronic acid derivatives using the catalyst. A complex comprising a center metal of palladium and a compound represented by the following general formula (1a) or (1b) as a ligand. A catalyst for asymmetric allylic substitution reaction being composed of the complex. A method of production of an optically active dialkyl (1,3-disubstituted propeny)malonate compound from a 1,3- disubstituted ally acetate compound and a dialkyl malonate and method of production of an optically active allylamine compound from a 1,3-disubstituted ally acetate compound and an amine compound. The compounds have not only the versatility of being usable in the synthesis of wide-ranging optically active aryl compounds but also the selectivity and reactivity permitting synthesis with high yield within a short period of time under industrially advantageous mild conditions.
New 6,6'-bis-(1-phosphanorbornadiene) diphosphines, their preparation and their uses
申请人:——
公开号:US20020042540A1
公开(公告)日:2002-04-11
A subject of the present invention is new 6,6′-bis-(1-phosphanorbornadiene) diphosphines, their preparation process and their use in asymmetrical catalysis.
The new diphosphines correspond to general formula (I):
1
in which R
1
, R
2
, R
3
, R
4
, R
5
are as defined in claim
1.
本发明的一个主题是新的6,6′-双(1-膦基冰片二烯)二膦、它们的制备过程及其在不对称催化中的用途。
新型二膦符合通式 (I):
1
其中 R
1
, R
2
, R
3
, R
4
, R
5
如权利要求
1.