Visible-Light-Induced C–O Bond Formation for the Construction of Five- and Six-Membered Cyclic Ethers and Lactones
作者:Honggu Im、Dahye Kang、Soyeon Choi、Sanghoon Shin、Sungwoo Hong
DOI:10.1021/acs.orglett.8b03166
日期:2018.12.7
Visible-light-induced intramolecular C–O bond formation was developed using 2,4,6-triphenylpyrylium tetrafluoroborate (TPT), which allows the regiocontrolled construction of cyclic ethers and lactones. The reaction is likely to proceed through the single-electron oxidation of the phenyl group, followed by the formation of a benzylic radical, thus preventing a competing 1,5-hydrogen abstraction pathway
Disclosed are substituted thioimidazolidinone compounds and pharmaceutical compositions comprising such compounds. The compounds and compositions can be used for treatment of androgen receptor-associated diseases or disorders, such as prostate cancer, benign prostatic hypertrophy, male hair loss and hypertrichosis.
Carboxylic Acid-Directed Manganese(I)-Catalyzed Regioselective Hydroarylation of Unactivated Alkenes
作者:Jingqiang Han、Huimin Yu、Weiwei Zi
DOI:10.1021/acs.orglett.2c02309
日期:2022.8.26
acid-directed regioselective hydroarylation reaction of unactivated alkenes with aryl boronic acids was reported. This transformation was enabled by homogeneous manganese catalyst MnBr(CO)5 in the presence of KOH and H2O in the m-xylene reaction medium. Both internal and terminal alkenes worked well in this transformation, and a series of functional groups were tolerated. This reaction not only provided an expeditious
报道了未活化烯烃与芳基硼酸的羧酸定向区域选择性加氢芳基化反应。在间二甲苯反应介质中存在 KOH 和 H 2 O的情况下,通过均相锰催化剂 MnBr(CO) 5实现了这种转化。内部和末端烯烃在这种转化中都表现良好,并且可以耐受一系列官能团。该反应不仅为从简单的起始原料制备γ-芳基羧酸提供了一种快速的方法,而且还将激发在有机合成中采用均相锰催化的进一步研究。
<i>β</i>
‐ and
<i>γ</i>
‐C(sp
<sup>3</sup>
)−H Heteroarylation of Free Carboxylic Acids: A Modular Synthetic Platform for Diverse Quaternary Carbon Centers
We report the first catalytic example of PdII-catalyzed mono-selective β- and γ-C (sp3)−H aza-heteroarylation of freecarboxylicacids. A sequence of three consecutive mono-selective C (sp3)−H activation reactions of pivalic acid provides an unique platform for constructing diversequaternarycarboncenters containing heteroaryls which could serve as an enabling tool for escaping the flat land in medicinal
amide-pyridone ligands, to achieve a regio-controllable synthesis of BCBs through a formal [2+2] cycloaddition involving σ bonds only (two C–H bonds and two aryl–halogen bonds). A wide range of cyclic and acyclic aliphatic acids, as well as dihaloheteroarenes, are compatible, generating diversely functionalized BCBs and hetero-BCBs present in drug molecules and bioactive natural products.