Double diastereodifferentiation in the hydroxylative knovenagel condensation
摘要:
The stereoinduction in formation of gamma-hydroxy-alpha,beta-unsaturated enoates using chiral alpha-sulfinyl esters and chiral aldehydes is a function of the absolute stereochemistry of the sulfoxide, the substituent on the sulfoxide, and the amount of base.
HETEROCYCLIC CARBOXYLIC ACID AMIDE LIGAND AND APPLICATIONS THEREOF IN COPPER CATALYZED COUPLING REACTION OF ARYL HALOGENO SUBSTITUTE
申请人:CE Pharm CO., LTD.
公开号:US20190127337A1
公开(公告)日:2019-05-02
Provided are a heterocyclic carboxylic acid amide ligand and applications thereof in a copper catalyzed coupling reaction. Specifically, provided are uses of a compound represented by formula (I), definitions of radical groups being described in the specifications. The compound represented by formula (I) can be used as the ligand in the copper catalyzed coupling reaction of the aryl halogeno substitute, and is used or catalyzing the coupling reaction for forming the aryl halogeno substitute having C—N, C—O, C—S and other bonds.
Ceramic boron carbonitrides for unlocking organic halides with visible light
作者:Tao Yuan、Meifang Zheng、Markus Antonietti、Xinchen Wang
DOI:10.1039/d1sc01028j
日期:——
halides, with visible light irradiation. Cross-coupling of halides to afford new C–H, C–C, and C–S bonds can proceed at ambient reaction conditions. Hydrogen, (het)aryl, and sulfonyl groups were introduced into the arenes and heteroarenes at the designed positions by means of mesolytic C–X (carbon–halogen) bond cleavage in the absence of any metal-based catalysts or ligands. BCN can be used not only
Using a simple copper(I) catalyst has allowed a high yielding sulfonylative-Suzuki–Miyaura cross-coupling reaction to be developed. The process provides a single step route to diaryl sulfones from the direct combination of aryl boronic acids, sulfur dioxide and aryl iodides, and represents the first sulfonylative variant of a classic cross-coupling reaction. Sulfur dioxide is delivered from the surrogate
PROCESS FOR PRODUCING AROMATIC OR HETEROAROMATIC SULFUR COMPOUNDS
申请人:SUMITOMO SEIKA CHEMICALS CO., LTD.
公开号:EP0742201A1
公开(公告)日:1996-11-13
The present invention provides a process for preparing an aromatic or heteroaromatic thiol represented by the formula (2), the process comprising hydrolyzing an aromatic or heteroaromatic halogenated methyl sulfide represented by the formula (1)
Ar(̵SCH3-mXm)n (1)
Ar(̵SH)n (2)
wherein Ar is an aromatic or heteroaromatic ring which has no substituent or which has an optional substituent or substituents, X is a halogen atom, m is an integer of 1 to 3 and n is 1 or 2.
According to the present invention, an aromatic or heteroaromatic thiol can be prepared at a commercially low cost and with ease.
PROCESS FOR THE PREPARATION OF AROMATIC OR HETEROAROMATIC SULFONYL HALIDES
申请人:SUMITOMO SEIKA CHEMICALS CO., LTD.
公开号:EP0770599A1
公开(公告)日:1997-05-02
The present invention is directed to a process for preparing an aromatic or heteroaromatic sulfonyl halide represented by the formula (3), the process comprising halogenating an aromatic or heteroaromatic methyl sulfide represented by the formula (1) or an aromatic or heteroaromatic methyl sulfoxide represented by the formula (2) with a halogenating agent in the presence of water
Ar(̵SCH3-mXm)n (1)
Ar(̵SOCH3-mXm)n (2)
Ar(̵SO2Y)n (3)
wherein Ar is an aromatic ring or a heteroaromatic ring which is unsubstituted or which has an optional substituent or substituents, X and Y are halogen atoms, m is an integer of 0 to 3 and n is 1 or 2.
According to the present invention, aromatic or heteroaromatic sulfonyl halides can be produced industrially cheaply and easily.