Highly Efficient Monophosphine-Based Catalyst for the Palladium-Catalyzed Suzuki−Miyaura Reaction of Heteroaryl Halides and Heteroaryl Boronic Acids and Esters
作者:Kelvin Billingsley、Stephen L. Buchwald
DOI:10.1021/ja068577p
日期:2007.3.1
active and efficient catalyst system derived from a palladium precatalyst and monophosphine ligands 1 or 2 for the Suzuki-Miyaura cross-coupling reaction of heteroaryl boronic acids and esters has been developed. This method allows for the preparation of a wide variety of heterobiaryls in good to excellent yields and displays a high level of activity for the coupling of heteroaryl chlorides as well as
[EN] C(SP3)-C(SP2) CROSS-COUPLING REACTION OF ORGANOZINC REAGENTS AND HETEROCYCLIC (PSEUDO)HALIDES<br/>[FR] RÉACTION DE COUPLAGE CROISÉ C(SP3)-C(SP2) DE RÉACTIFS D'ORGANOZINC ET DE (PSEUDO)HALOGÉNURES HÉTÉROCYCLIQUES
申请人:UNIV HONG KONG SCI & TECH
公开号:WO2018019291A1
公开(公告)日:2018-02-01
Provided is a method of synthesizing a C(sp3)-C(sp2) cross-coupled compound comprising reacting a C(sp3) coupling partner with a C(sp2) coupling partner, a catalyst, and a solvent; wherein the C(sp3) coupling partner comprises an organic zinc reagent; and wherein the C(sp2) coupling partner comprises a heterocyclic halide or a heterocyclic pseudo halide. The method further comprises synthesis of the organic zinc reagent, wherein the synthesis comprises reacting a zinc powder with an acid, filtering, washing, and drying to obtain an activated zinc powder; and reacting the activated zinc powder with a metal iodide catalyst and a second solvent and heating for a predetermined time to obtain the organic zinc reagent.
The present invention relates to antagonists of the S1P3 receptor formula (A) as herein described and pharmaceutical compositions thereof. The compounds of formula (A) are useful in the preparation of a medicament, in particular for the treatment of Alzheimer's disease.
作者:Zheng‐Jun Wang、Xiangyang Chen、Lei Wu、Jonathan J. Wong、Yong Liang、Yue Zhao、Kendall N. Houk、Zhuangzhi Shi
DOI:10.1002/anie.202016573
日期:2021.4.6
conspicuously underdeveloped. Here, we develop a general strategy for the site‐selective C−Hborylation of pyrroles by using only BBr3 directed by pivaloyl groups, avoiding the use of any metal. The site‐selectivity is generally dominated by chelation and electronic effects, thus forming diverse C2‐borylated pyrroles against the steric effect. The formed products can readily engage in downstream transformations
Cp*Co(III)‐Catalyzed Dehydrative C2‐Prenylation of Pyrrole and Indole with Allyl Alcohols
作者:Suchand Basuli、Samrat Sahu、Shuvendu Saha、Modhu Sudan Maji
DOI:10.1002/adsc.202100811
日期:2021.10.5
Non-activated allyl alcohols are utilized as allylating agent for thiocarbamate-directed allylation of pyrrole and indole. The synthetic methodology is accompanied by advantages like silver-free conditions and generates water as the by-product. A wide range of substituted pyrroles and indoles along with several structurally different allyl alcohols took part in the reaction. Among notable examples