Reductive Coupling of Allylic Esters with Carbonyl Compounds Mediated by the Mischmetall/[SmI2/Pd0cat.′]cat. System
作者:Sédami Médégan、Florence Hélion、Jean-Louis Namy
DOI:10.1002/ejoc.200500291
日期:2005.11
“two-stage catalysis” has been carried out using SmI2 and Pd(PPh3)4 in catalytic amounts together with mischmetall (an alloy of the light lanthanides) as a co-reductant. A catalytic scheme that takes into account previously reported reactions of SmI2/Pd0cat. and mischmetall/SmI2,cat. systems is proposed. It has also been shown that palladium complexes catalyse the addition of organolanthanide species
One-Pot, Three-Component Synthesis of Linearly Substituted Homoallylic Alcohols via Allyl(isopropoxy)dimethylsilane
作者:Lianhai Li、Neenah Navasero
DOI:10.1021/ol048892l
日期:2004.9.1
[reaction: see text] A two-step approach that involves the synthesis of vinylsilane from allyl(isopropoxy)dimethylsilane (6) and the subsequent Pd-catalyzed cross-coupling of the resulting vinylsilane is applied in developing a novel diversity-oriented, three-componentsynthesis to homoallylicalcohols of common structure 1. Upon treatment of 6 with s-BuLi, the silylallylmetal 5 is generated and reacted
Zinc-mediated α-regioselective Barbier-type cinnamylation reactions of aldehydes, ketones and esters
作者:Li-Ming Zhao、Hua-Shuai Gao、De-Feng Li、Jing Dong、Lan-Lin Sang、Jie Ji
DOI:10.1039/c7ob00723j
日期:——
Experimental results suggest that the reactions proceed through the radical pathway. In addition, the reaction was found to be scalable to the gram-scale and the one-potprotocol is also applicable to less reactive esters leading to bishomoallylic alcohols which were valuable intermediates for desymmetrizing intramolecular Heck cyclization, allowing for the elaboration to functionalized building blocks.
Highly regioselective iridium-catalyzed and samarium-promoted coupling of allylic carbonates with ketones: a new approach towards homoallylic alcohols
作者:Wei Liu、Liang Zhang、Weikang Yang、Xiaoming Zhao
DOI:10.1039/c3ra43199a
日期:——
A highlyregioselective Ir-catalyzed and Sm-promoted coupling of allyliccarbonates with ketones has been realized, which provides the homoallylic alcohols in up to 89% yields. This strategy gives a convenient method for the synthesis of liquid crystals with a mono-fluorinated quaternary carbon chain.