Double Couplings of Dibromothiophenes Using Boronic Acids and Boronates
作者:Scott Handy、Samantha Varello
DOI:10.1055/s-0028-1083262
日期:2009.1
couplings work well for 2,4-dibromothiophene, but are much more sensitive to steric effects in the case of 2,3-dibromothiophene. By using the recently reported potassium borates, though, good yields for both dibromothiophene isomers can be achieved. Suzuki couplings - regioselectivity - heteroaromatics - thiophenes - cross-coupling reactions - palladium catalysis
Sterically controlled C–H alkenylation of pyrroles and thiophenes
作者:Eunsu Kang、Ju Eun Jeon、Siyeon Jeong、Hyun Tae Kim、Jung Min Joo
DOI:10.1039/d1cc04378a
日期:——
Pd-catalyzed C–H alkenylations targeting the least hindered position of N-alkyl pyrroles and 3-substituted thiophenes, as opposed to electronically controlled approaches, are developed. The steric demand and stable bidentate binding mode of the pyrazolonaphthyridine ligand are key to the success of these sterically controlled alkenylations using oxygen as an oxidant.