Radical carbonylations with fluorous allyltin reagents
作者:Ilhyong Ryu、Tatsuro Niguma、Satoshi Minakata、Mitsuo Komatsu、Zhiyong Luo、Dennis P. Curran
DOI:10.1016/s0040-4039(99)00188-4
日期:1999.3
“Propylene-spaced” fluorous allyltinreagents 2a and 2b were tested as mediators of radical carbonylations and found to be useful for four-component coupling reactions comprising RX 3, CO, alkenes, and 2 leading to β-functionalized β-allylated ketones 5. The biphasic workup (acetonitrile/FC-72) was successfully carried out to separate 5 from tin compounds. Competition experiments suggested a modest
测试了“丙烯间隔的”氟代烯丙基锡试剂2a和2b作为自由基羰基化的介质,发现可用于四组分偶联反应,包括RX 3,CO,烯烃和2,从而导致β-官能化的β-烯丙基化酮5。成功进行了双相后处理(乙腈/ FC-72),从锡化合物中分离出5种化合物。竞争实验表明,与常规的烯丙基三丁基锡相比,对于涉及S H 2'步骤的链增长,适度的反应性为2a。
Separation of “Light Fluorous” Reagents and Catalysts by Fluorous Solid-Phase Extraction: Synthesis and Study of a Family of Triarylphosphines Bearing Linear and Branched Fluorous Tags
作者:Qisheng Zhang、Zhiyong Luo、Dennis P. Curran
DOI:10.1021/jo000464f
日期:2000.12.1
Practical syntheses of new triarylphosphines bearing both linear and branched fluorous tags (Rf) are reported. The phosphines have one, two, or all three aryl rings bearing fluorous tags: (Ph)(3-n)P(C6H4(CH2)(m)Rf)(n) Fluorous-organic partition coefficients have been measured and the retention properties of both the phosphines and the derived phosphine oxides on fluorous reverse phase silica have been studied. While applications relying on liquid-liquid extractive separations of these phosphines may be limited to those bearing three fluorous chains, the technique of solid phase extraction should be broadly applicable to phosphines, phosphine oxides, and derived metal complexes. A parallel platinum-catalyzed allylation of aldehydes with fluorous allyl stannanes illustrates the usefulness of the new fluorous ligands in small-scale synthesis.
Curran, Dennis P.; Luo, Zhiyong, Medicinal Chemistry Research, 1998, vol. 8, # 4-5, p. 261 - 265