Palladium-Catalyzed Allyl Cross-Coupling Reactions with In Situ Generated Organoindium Reagents
作者:Kooyeon Lee、Hyunseok Kim、Juntae Mo、Phil Ho Lee
DOI:10.1002/asia.201000890
日期:2011.8.1
compounds may be effective nucleophilic coupling partners in palladium‐catalyzed cross‐coupling reactions. A variety of allyl halides, such as allyl iodide, allyl bromide, crotyl bromide, prenyl bromide, geranyl bromide, and 3‐bromocyclohexene afforded the allylic cross‐coupling products in good to excellent yields. Stereochemistry of the double bond is retained in the allylic cross‐coupling reactions
Heterodimerization of Olefins. 1. Hydrovinylation Reactions of Olefins That Are Amenable to Asymmetric Catalysis
作者:T. V. RajanBabu、Nobuyoshi Nomura、Jian Jin、Malay Nandi、Haengsoon Park、Xiufeng Sun
DOI:10.1021/jo035171b
日期:2003.10.1
counteranion (BARF or SbF6) in an enantioselective version of the Ni-catalyzed reaction raises the prospects of developing a practical route for the synthesis of 3-arylbutenes. Several pharmaceutically relevant compounds, including widely used 2-arylpropionic acids, can be synthesized from these key intermediates. This reaction appears to be quite general. Synthesis of several new 2-diphenylphosphino-1
通过对配体和抗衡离子作用的系统检查,发现了用于乙烯和各种功能化乙烯基芳烃的近定量和高度选择性共聚的新方案。在典型的反应中,在-56℃下,在[CH2Cl2]中,在[CH3Cl2]中分别存在0.0035当量的[(烯丙基)NiBr] 2,三苯膦和AgOTf,4-溴苯乙烯和乙烯进行共二聚,得到3-(4-溴苯基)-1 -丁烯的收率和选择性均> 98%。与[(烯丙基)PdX] 2的相应反应效率低下且选择性低,在鉴定出可行的系统之前可能需要进一步优化。产生可比的产率和选择性的另一有用方案涉及使用由2-二苯基膦基苯甲酸烯丙酯,Ni(COD)2和(C 6 F 5)3 B制备的单组分催化剂。识别手性半不稳定配体(例如,(R)-2-甲氧基-2'-二苯基膦基-1,1'-联萘基,MOP)与高度离解的抗衡阴离子(BARF或SbF6)之间的协同关系Ni催化的反应的发展提出了开发合成3-芳基丁烯的实用路线的前景。可以从这
MIDA boronate allylation – synthesis of ibuprofen
作者:David Phillips、Glen Brodie、Sarah Memarzadeh、Gi Lum Tang、David J. France
DOI:10.1039/d0ra03338c
日期:——
MIDAboronates are among the most useful reagents for the Suzuki–Miyaura reaction. This chemistry typically generates new bonds between two aromatic rings, thereby restricting access to important areas of chemical space. Here we demonstrate the coupling of MIDAboronates to allylic electrophiles, including a new synthesis of the well-known COX inhibitor ibuprofen.
MIDA 硼酸盐是铃木-宫浦反应最有用的试剂之一。这种化学通常会在两个芳环之间产生新的键,从而限制进入化学空间的重要区域。在这里,我们展示了 MIDA 硼酸盐与烯丙基亲电子试剂的偶联,包括众所周知的 COX 抑制剂布洛芬的新合成。
γ-Selective Cross-coupling of Potassium Allyltrifluoroborates with Aryl and 1-Alkenyl Bromides Catalyzed by a Pd(OAc)<sub>2</sub>/D-<i>t</i>-BPF Complex
作者:Yasunori Yamamoto、Shingo Takada、Norio Miyaura
DOI:10.1246/cl.2006.704
日期:2006.7
Cross-coupling reactions of [RCH=CHCH2BF3]K with aryl or 1-alkenyl bromides occurred at the γ-carbon of an allylborane moiety with perfect regioselectivities (>99%) in the presence of a palladium/D-t-BPF complex and K2CO3 in refluxing THF.
Nickel Catalyzed Hydrovinylation of Arylethylenes: General Method of Synthesis of α-Arylpropionic Acids Intermediates
作者:Viviane Fassina、Carolina Ramminger、Marcus Seferin、Adriano L Monteiro
DOI:10.1016/s0040-4020(00)00668-2
日期:2000.9
The hydrovinylation of arylethylenes catalyzed by [Ni(MeCN)6][BF4]2/AlEt2Cl/PPh3 was modulated to obtain 3-aryl-1-butenes in high yields and selectivities. A wide variety of arylethylenes containing electron-donating or electron-withdrawing groups and Lewis basic group, can be hydrovinylated at room temperature and under mild conditions by changing the relative ratios of the three-component catalyst