Axially Asymmetric Phosphorus Compound and Production Method Thereof
申请人:Tanaka Ken
公开号:US20090227805A1
公开(公告)日:2009-09-10
Problem to be Solved: To provide an axially asymmetric optically active biarylphosphorus compound that can easily produced without the step of optical resolution which was almost indispensable in conventional methods.
Solution: A method for producing an axially asymmetric phosphorus compound represented by the general formula (1), comprising a cycloaddition reaction of a compound having a triple bond with the use of a catalyst containing rhodium metal and an optically active bisphosphine.
(In the formula, J is an oxygen atom, a sulfur atom or BH
3
; R
1
and R
2
independently are an alkyl, cycloalkyl, aryl, alkoxy and aryloxy group; a1 and a2 independently are 0 or 1; R
3
to R
10
independently are an alkyl, cycloalkyl, aryl, alkoxy and aryloxy group; two among R
3
to R
10
may form a ring;
and * is axial asymmetry.)
Copper(I) Diphosphine Bifluoride Complexes as Efficient Preactivated Catalysts for Nucleophilic Addition on Unsaturated Functional Groups
作者:Corentin Rasson、Olivier Riant
DOI:10.1021/acs.oprd.9b00443
日期:2020.5.15
Herein we report the synthesis of a family of copper(I) diphosphine bifluoride complexes, their characterization, and their use as efficient preactivated catalysts for nucleophilic copper addition of pronucleophiles on unsaturations. Their use as mechanistic probes is also highlighted by the identification of two copper deuterides.
Hydroxymethylation beyond Carbonylation: Enantioselective Iridium-Catalyzed Reductive Coupling of Formaldehyde with Allylic Acetates via Enantiotopic π-Facial Discrimination
作者:Victoria J. Garza、Michael J. Krische
DOI:10.1021/jacs.6b01078
日期:2016.3.23
2-propanol-mediated reductive coupling of branched allylic acetates 1a-1o with formaldehyde to form primary homoallylic alcohols 2a-2o with excellent control of regio- and enantioselectivity. These processes, which rely on enantiotopic π-facial discrimination of σ-allyliridium intermediates, represent the first examples of enantioselective formaldehyde C-C coupling beyond aldol addition.
SEGPHOS 修饰的手性铱配合物可催化 2-丙醇介导的支链烯丙乙酸酯 1a-1o 与甲醛的还原偶联,形成高烯丙醇 2a-2o,并具有出色的区域选择性和对映选择性控制。这些过程依赖于 σ-烯丙基铱中间体的对映体 π-面辨别,代表了羟醛加成以外的对映选择性甲醛 CC 偶联的第一个例子。
METHOD FOR CONVERTING HYDROXYL GROUP OF ALCOHOL
申请人:Takasago International Corporation
公开号:US20210047254A1
公开(公告)日:2021-02-18
The present invention relates to: a method for converting a hydroxyl group of an alcohol; and a catalyst which makes the method possible. A method for converting a hydroxyl group of an alcohol according to the present invention is characterized by producing a compound represented by CH(R
1
)(R
2
)Nu (wherein R
1
, R
2
and Nu are as defined below) by reacting an alcohol represented by CH(R
1
)(R
2
)OH (wherein each of R
1
and R
2
represents a hydrogen atom, an optionally substituted alkyl group, or the like) and a compound having an active proton, which is represented by H-Nu (wherein Nu represents a group represented by —CHX
1
-EWG
1
or —NR
3
R
4
; X
1
represents a hydrogen atom or the like; EWG
1
represents an electron-withdrawing group; and each of R
3
and R
4
represents a hydrogen atom, an optionally substituted alkyl group, or the like), with each other in the presence of a complex of a group 7-11 metal of the periodic table and at least one solid base that is selected from the group consisting of layered double hydroxides, composite oxides and calcium hydroxide.
Reaction mixtures for silvlating arene substrates and methods of using such reaction mixtures to silyiate the arene substrates are provided. Exemplary reaction mixtures include the arene substrate, a liganded metal catalyst, a hydrogen acceptor and an organic solvent. The reaction conditions allow for diverse substituents on the arene substrate.