Enantiodivergent and γ-Selective Asymmetric Allylic Amination
作者:Jianmin Wang、Jie Chen、Choon Wee Kee、Choon-Hong Tan
DOI:10.1002/anie.201107317
日期:2012.3.5
judicious choice of the double bond geometry of the the β,γ‐unsaturated carbonyl compound. Computational studies reveal the possible origin of the inversed enantioselectivity, and the potential for enantiodivergent synthesis chiral amine‐containing substrates is attractive.
Regioselective Ni-Catalyzed Carboxylation of Allylic and Propargylic Alcohols with Carbon Dioxide
作者:Yue-Gang Chen、Bin Shuai、Cong Ma、Xiu-Jie Zhang、Ping Fang、Tian-Sheng Mei
DOI:10.1021/acs.orglett.7b01208
日期:2017.6.2
efficient Ni-catalyzed reductive carboxylation of allylic alcohols with CO2 has been successfully developed, providing linear β,γ-unsaturated carboxylic acids as the sole regioisomer with generally high E/Z stereoselectivity. In addition, the carboxylic acids can be generated from propargylicalcohols via hydrogenation to give allylic alcohol intermediates, followed by carboxylation. A preliminary mechanistic
Efficient Pd-Catalyzed Regio- and Stereoselective Carboxylation of Allylic Alcohols with Formic Acid
作者:Ming-Chen Fu、Rui Shang、Wan-Min Cheng、Yao Fu
DOI:10.1002/chem.201701971
日期:2017.7.3
Formic acid is efficiently used as a C1 source to directly carboxylate allylicalcohols in the presence of a low loading of palladium catalyst and acetic anhydride as additive to afford β,γ‐unsaturated carboxylic acids with excellent chemo‐, regio‐, and stereoselectivity. The reaction proceeds through a carbonylation process with in situ‐generated carbon monoxide under mild conditions, avoiding the
Taming the Carboxyl Group for Directed Carbometalation-Observations on the Use of Anions, Dianions and Ester Enolates
作者:Sandy Desrat、Philip J. Gray、Matthew R. Penny、William B. Motherwell
DOI:10.1002/chem.201403294
日期:2014.6.23
Carboxylate anions, dianions and esterenolates provide simultaneous protection and activation for directed carbometalation reactions. Advantage can be taken of the bis‐carbanionic character of the intermediate for further controlled CC bond forming reactions.