Selective Carboxylate Directed <i>ortho</i>
Functionalization in Copper Catalyzed Reactions of Polyiodo Aromatics: A Straightforward Preparation of 5,7-Diiodo-1<i>H</i>
-isochromen-1-ones
A straightforward copper-catalyzedsynthesis of 5,7-diiodo-1H-isochromen-1-ones was developed by startingfrom 2,3,5-triiodo benzoic acid and terminal alkynes
Stereoselective construction of ethyl (13E)-trifluoromethylretinoate was achieved through two successive Stille reactions. The coupling of (E)-1,2-bis(tributylstannyl)ethene and ethyl (Z)-4,4,4-trifluoro-3-iodobut-2-enoate was performed first and followed by iododestannylation. The second step involved another vinyltin which was synthetised by stannylmetallation of the Nigishi dienyne 4c derived from
Regioselective Synthesis of (E)-5-(Tributylstannylmethylidene)-5H-furan-2-ones and (E)-3-(Tributylstannylmethylidene)-3H-isobenzofuran-1-ones: Easy Access to γ-Alkylidenebutenolide and Phthalide Skeletons
Regio- and stereoselective synthesis of γ-alkylidenebutenolides and γ-alkylidenephthalides has been achieved through the palladium-catalysed tandem cross-coupling/cyclisation reactions of tributylstannyl-3-iodopropenoate or the 2-iodo benzoate derivatives with tributyltinacetylene. Iododestannylation occurred with inversion of the configuration of the exocyclic double bond in the case of butenolides, but with retention of configuration for the phthalide. The selectivity observed in the Stille reaction was found to be dependent on the nature of the vinyl or the aryl halide.
ylic acid, and terminal alkynes was developed under very mildconditions. This method allows the introduction in one pot of a third ring fused in positions 2 and 3 of the imidazo[1,2-a]pyridine core with reasonable yields and total regioselectivity. This procedure does not require the use of any expensive supplementary additives, and is palladium-free.
一般有效的Cu(I)介导的C的交叉偶联和杂环化反应3-碘咪唑并[1,2- a ]吡啶-2-羧酸,并且末端炔烃是在非常温和的条件下形成的。该方法允许以合理的收率和总区域选择性在一个锅中引入稠合在咪唑并[1,2- a ]吡啶核的2和3位的第三环。该步骤不需要使用任何昂贵的补充添加剂,并且不含钯。
Domino allylic amination/Sonogashira/heterocyclisation reactions: palladium-catalysed three-component synthesis of pyrroles
Three-component reactions with 3,4-diiodoalk-2-enoic derivatives, primary amines, and terminal alkynes proceeded to give trisubstituted pyrroles in fair to good yields in the presence of palladium and copper catalysts under mild reaction conditions.