Palladium-catalyzed alkene-directed cross-coupling of aryliodide with another aryl halide through C-H arylation opens a unique avenue for unsymmetrical biaryl-derived molecules. However, homo-coupling of aryliodides often erodes the overall synthetic efficiency. Reported herein is a highly chemoselective Pd0 -catalyzed alkyne-directed cross-coupling of aryliodides with bromophenols, which was subsequently
PROCESS FOR PREPARATION OF DIETHYLENETRIAMINEPENTAACETIC ACID DERIVATIVE, AND DIETHYLENETRIAMINEPENTAACETIC ACID DERIVATIVE
申请人:Nemoto Hisao
公开号:US20120203027A1
公开(公告)日:2012-08-09
The objective of the present invention is to provide a process for simple and efficient preparation of an intermediate compound to synthesize a gadolinium complex having a substituent for improving a retention property in blood time and specificity to an intended organ. The objective of the present invention is also to provide an intermediate compound produced by the said production process. The process for preparation of the diethylenetriaminepentaacetic acid derivative (I):
wherein R
1
to R
5
are independently C
1-6
alkyl groups;
comprising the steps of:
reacting a diethylenetriaminepentaacetic acid pentaester with a halogenated ally compound in an aprotic solvent;
removing the excess halogenated ally compound (III); and
reacting a reaction product of the diethylenetriaminepentaacetic acid pentaester and the halogenated ally compound with a base in a solvent.
Multicomponent Reductive Cross‐Coupling of an Inorganic Sulfur Dioxide Surrogate: Straightforward Construction of Diversely Functionalized Sulfones
作者:Yingying Meng、Ming Wang、Xuefeng Jiang
DOI:10.1002/anie.201911449
日期:2020.1.13
oxidants. Now, a multicomponent reductive cross-coupling involving an inorganic salt (sodium metabisulfite) for the straightforward construction of sulfones is disclosed. Both intramolecular and intermolecular reductive cross-couplings were comprehensively explored, and diverse sulfones were accessible from the corresponding alkyl and aryl halides. Intramolecular cyclic sulfones were systematically obtained
Selective C(sp
<sup>3</sup>
)−N Bond Cleavage of
<i>N</i>
,
<i>N</i>
‐Dialkyl Tertiary Amines with the Loss of a Large Alkyl Group via an S
<sub>N</sub>
1 Pathway
alkyne-tethered aryl iodides with tertiary hydroxylamines has been developed for the rapid assembly of 3,4-fused tricyclic indoles with a removable aliphatic N-substituent. This domino reaction was realized by alkyne-directed palladacycle formation, electrophilic amination with tertiary hydroxylamines and selective C(sp3)−N bond cleavage with the loss of the larger alkyl group via an SN1 path.
已经开发了一种新型 Pd 0催化的 [2+2+1] 炔烃连接芳基碘化物与叔羟胺的环化反应,用于快速组装具有可去除脂肪族N取代基的 3,4-稠合三环吲哚。这种多米诺骨牌反应是通过炔烃定向的钯环形成、叔羟胺的亲电胺化和选择性 C(sp 3 )-N 键断裂以及通过 S N 1 路径损失更大的烷基来实现的。