Photostimulated Reactions of Phenylacetic Acid Dianions with Aryl Halides. Influence of the Metallic Cation on the Regiochemistry of Arylation
作者:Godson C. Nwokogu、Jim-Wah Wong、Thomas D. Greenwood、James F. Wolfe
DOI:10.1021/ol006177f
日期:2000.8.1
[reaction: see text]Phenylacetic acid dianions react via what appears to be an S(RN)1 process with aryl halides under photostimulation to afford aryl substitution products 5 and 6. When the counterion is K+, only 4-biphenylacetic acids 5 are obtained. Both alpha- and para-coupling occurs with Na+ to give a mixture of 5 and 6, while exclusive formation of diphenylacetic acids 6 is observed with the
Lactone synthesis via dyotropic rearrangement. Stereospecific construction of fused butyrolactones with three contiguous asymmetric centers
作者:T.Howard Black、William J. DuBay
DOI:10.1016/s0040-4039(00)82032-8
日期:1988.1
Substituted trans-fused cyclohexano butyrolactones are accessible via dyotropic rearrangement of β-lactones, wherein all three adjacent chiral centers are simultaneously fixed.
Synthesis of benzhydryl ethers by a carbon-carbon bond-forming reaction using benzhydryl 2-chloroethyl ether. A method for attaching a protected 2-hydroxyethyl group to a benzylic carbon