We herein report a robust catalyst‐free cross‐coupling between ArI(OAc)2 and α‐stannyl nitriles, aided by TMSOTf. The transformation introduces a cyanoalkyl group to the ortho position of ArI(OAc)2 and simultaneously reduces the aryl iodine(III) to iodide, thus providing α‐(2‐iodoaryl) nitrile as the product. This transformation could be completed within 5 min at −78 °C and features superb functional‐group
cyanomethyl radical species is generated from a cyanomethylphosphonium ylide by irradiation with visible light in the presence of an iridium complex, a thiol, and ascorbic acid. The cyanomethyl radical species then adds across the C=C double bond of an alkene to form an elongated alkyl radical species that accepts a hydrogen atom from the thiol to produce an elongated aliphaticnitrile. The ascorbic
Compound of the formula: (I) [wherein each of X
1
, X
2
, and X
3
independently represents N or CH, W represents the formula (II):(II) or the formula (III):(III) and Y represents a group of the formula (IV):(IV)], or a pharmacologically acceptable salt thereof. This compound exhibits histamine receptor H3 antagonist or inverse agonist activity and is useful of the treatment and/or prevention of obesity, diabetes, hormonal secretion abnormality, sleep, disorder, etc.
Provided are compounds of a formula (I) and their pharmaceutically-acceptable salts:
wherein X1, X2 and X3 each independently represent N or CH; W represents the following formula (II):
or the following formula (III):
Y represents a group of a formula (IV):
The compounds have a histamine-H3 receptor antagonistic or inverse-agonistic activity and are useful for remedy and/or prevention of obesity, diabetes, hormone secretion disorders, sleep disorders, etc.