The present invention provides a compound of Formula (I)
or a pharmaceutically acceptable salt thereof wherein R
1
, R
2
, R
3
, A
1
, A
2
, A
3
, A
4
, L, B
1
, B
2
, B
3
and B
4
are as defined herein. The compounds of Formula I have been found to act as glucagon antagonists or inverse agonists. Consequently, the compounds of Formula I and the pharmaceutical compositions thereof are useful for the treatment of diseases, disorders, or conditions mediated by glucagon.
N-Heterocyclic carbene-catalyzed deaminative cross-coupling of aldehydes with Katritzky pyridinium salts
作者:Inwon Kim、Honggu Im、Hyeonyeong Lee、Sungwoo Hong
DOI:10.1039/d0sc00225a
日期:——
By employing an N-heterocycliccarbene (NHC) catalyst, we developed a versatile catalyticsystem that enables deaminative cross-coupling reactions of aldehydes with redox-active pyridinium salts. Katritzky pyridinium salts behave as single-electron oxidants capable of generating alkyl radicals enabled by the redox properties of the enolate form of Breslowintermediates. The resultant alkyl radical