Copper-catalyzed enantioselective 1,2-borylation of 1,3-dienes
作者:Yangbin Liu、Daniele Fiorito、Clément Mazet
DOI:10.1039/c8sc01538d
日期:——
borylation of 2-substituted 1,3-dienes is reported. The use of a chiral phosphanamine ligand is essential in achieving high chemo-, regio-, diastereo- and enantioselectivity. It provides access to a variety of homoallylic boronates in consistently high yield and enantiomeric excess with 2-aryl and 2-heteroaryl 1,3-dienes as well as sterically demanding 2-alkyl 1,3-dienes. Preliminary investigations
The rhodium-catalyzed controllable diverse arylation of 2,5-dihydrofuran with arylboronic acids is reported. By fine-tuning of the reaction conditions, four different ring-opening or oxidative arylation pathways are controlled in the rhodium-catalyzedarylation of 2,5-dihydrofuran, granting selective access to 2-aryl or 3-aryl homoallylic alcohols and 3-aryl or 4-aryl-2,3-dihydrofurans. The catalytic
A highly enantioselectiveallylic substitution of (Z)-but-2-ene-1,4-diol derivatives was developed using a rhodium(I) catalyst and arylboronic acids as nucleophiles. The reaction yields versatile homoallylicalcohols from readily available linear biscarbonates. homoallylicalcohols - rhodium - boronic acids - desymmetrization - asymmetric allylic substitution