探索主族元素催化活性的研究很有吸引力。我们在此报告我们对铋试剂与亚磺酸盐或 SO 2替代物磺酰化的研究。在氧化条件下,三芳基铋和亚磺酸盐转化为二芳基砜。该反应在Bi中心实现了类似过渡金属的双电子氧化还原过程。原位生成的二氧化硫也可以替代亚磺酸盐以提供相应的对称二芳基砜。还提出了该反应的合理机制,涉及 Bi(III)-Bi(V) 流形。
Rapid Bis-Coupling Reactivity with Triarylbismuth Reagents: Synthesis of Structurally Diverse Scaffolds and Step-economic Convergent Synthesis of Quebecol
作者:Maddali L. N. Rao、Venneti N. Murty、Sachchida Nand
DOI:10.1002/ejoc.201901830
日期:2020.3.22
The cross‐coupling study of gem‐dibromoesters with triarylbismuths furnished a variety of multi‐functional trisubstituted acrylates embedded with aryl, alkene and alkyne scaffolds in high yields under palladium catalysis. Further, the established method was applied in the step‐economic and convergentsynthesis of quebecol natural product in good yield.
Pd(0)/C-catalyzed cross-couplings of acyl chlorides with triarylbismuths as atom-efficient sub-stoichiometric multi-coupling reagents
作者:Maddali L.N. Rao、Deepak N. Jadhav、Varadhachari Venkatesh
DOI:10.1016/j.tetlet.2009.05.003
日期:2009.7
Aromatic and hetero-aromatic acylchlorides were efficiently cross-coupled with triarylbismuths as atom-efficient nucleophilic organometallic coupling reagents in sub-stoichiometric amounts using catalytic Pd(0)/C. Thus, the coupling reactions of various triarylbismuths with a variety of acylchlorides furnished a plethora of both symmetrical/unsymmetrical aromatic and hetero-aromatic ketones in high
Palladium-catalyzed cross-couplings of allylic carbonates with triarylbismuths as multi-coupling atom-efficient organometallic nucleophiles
作者:Maddali L.N. Rao、Debasis Banerjee、Somnath Giri
DOI:10.1016/j.jorganchem.2010.03.010
日期:2010.5
Allylic carbonates were efficiently cross-coupled with triarylbismuthsunderpalladiumcatalysis. Using the optimized protocol, arylations of various allylic carbonates were carried out with triarylbismuths to afford high yields of 1,3-disubstituted propenes in regio- and chemo-selective manner. Triarylbismuths were employed as multi-coupling atom-efficient organometallic nucleophiles in sub-stoichiometric
Pd-catalyzed atom-efficient cross-coupling of triarylbismuth reagents with protecting group-free iodophenylmethanols: Synthesis of biarylmethanols
作者:Maddali L.N. Rao、Suresh Meka
DOI:10.1016/j.tetlet.2020.151676
日期:2020.3
An atom-efficient procedure for the synthesis of functionalized biarylmethanols via the Pd-catalyzedcross-coupling reactions of differently functionalized iodophenylmethanols and triarylbismuth reagents is described. This protecting group-free direct couplings of 2-, 3- or 4-iodophenylmethanols with triarylbismuth reagents afforded biarylmethanols in good to high yields.