Palladium/monophosphine complexes catalyze trans-selective arylative, alkenylative, and alkylativecyclization reactions of alkynals and alkynones with organoboronic reagents. These reactions afford six-membered allylic alcohols with endo-tri- or tetrasubstituted olefin groups and/or five-membered counterparts with exo olefin groups. The ratios of these products are dramatically affected by alkyne
Palladium(0)‐Catalyzed
<i>Anti</i>
‐Selective Addition‐Cyclizations of Alkynyl Electrophiles
作者:Hirokazu Tsukamoto、Kazuya Ito、Tatsuhiko Ueno、Mitsugu Shiraishi、Yoshinori Kondo、Takayuki Doi
DOI:10.1002/chem.202203068
日期:2023.1.27
Palladium(0)/monophosphine complexes catalyze anti-selective arylative cyclizations of alkynyl electrophiles with organometallic reagents. Remarkably, the regioselectivity in the cyclization of conjugated diyne-aldehydes can be controlled by a choice of the phosphine ligand, with triphenylphosphine and tricyclohexylphosphine leading to the exclusive formation of 2-alkylidene-cyclopentanol and 2-cyclohexen-1-ol