Alcohols react with arenes in the presence of cationic iron(III) porphyrin catalyst. The reaction involves the formation of the C–C bond via dehydration, which is formal Lewis acid catalyzed Friedel–Craftsreaction.
Rhodium-Catalyzed Allylic Substitution Reactions with Indium(III) Organometallics
作者:Ricardo Riveiros、Rubén Tato、José Pérez Sestelo、Luis A. Sarandeses
DOI:10.1002/ejoc.201200104
日期:2012.5
novel rhodium-catalyzed allylic substitution reaction using indium organometallics is reported. Aryl- and heteroarylindium reagents reacted in THF at 80 °C with primary and secondary allyl halides and their derivatives under rhodium(I) catalysis to afford the α-substituted products in good yields and with high regio- and stereoselectivity. The reaction takes place with substoichiometric amounts of
A cross-coupling reaction between aryl- and vinylboronicacids and various allylic bromides proceeded without the use of a transition-metal catalyst to give the corresponding allylated products in moderate to good yields. The use of an inorganic base (KF or Cs2CO3) and a small amount of water is crucial in obtaining good performance in the present transition-metal-free reaction. transition-metal-free
在不使用过渡金属催化剂的情况下,进行了芳基和乙烯基硼酸与各种烯丙基溴之间的交叉偶联反应,以中等至良好的产率得到了相应的烯丙基化产物。在目前的无过渡金属反应中,使用无机碱(KF或Cs 2 CO 3)和少量水对于获得良好的性能至关重要。 无过渡金属-CC键形成-芳基和乙烯基硼酸
Palladium-catalyzed cross-coupling reactions of organogold(i) phosphanes with allylic electrophiles
作者:Miguel Peña-López、Miguel Ayán-Varela、Luis A. Sarandeses、José Pérez Sestelo
DOI:10.1039/c2ob06788a
日期:——
as cinnamyl and geranyl halides (bromide, chloride and acetates) under palladium catalysis in THF at 80 °C to afford the α-substitution product with moderate to high yields. When the reaction is performed with a chiral enantiopure secondary acetate, the α-substituted cross-coupling product is obtained with complete inversion of the stereochemistry.
We have found that cross-coupling between aryl Grignard reagents and allylic methylethers proceeded well in the presence of a catalytic amounts of Fe(acac)3 to afford the corresponding allylic substitution products in good yields. Under the same conditions, allylic trimethylsilyl ethers also reacted with Grignard reagents to give the corresponding cross-coupling products.