The first example of manganese-catalyzed C-alkylation of the carboxylic acid derivatives is reported. The bench-stable homogeneous manganese complex enables the transformation of the renewable alcohol and carboxylic acid derivative feedstock to higher value esters and amides. The reaction operates via hydrogen autotransfer and ideally produces water as the only side product. Importantly, aliphatic-
Palladium-catalyzed allylation and deacylative allylation of 3-acetyl-2-oxindoles with allylic alcohols
作者:Aitor Ortega-Martínez、Rocco de Lorenzo、José M. Sansano、Carmen Nájera
DOI:10.1016/j.tet.2017.11.041
日期:2018.1
Pd-catalyzed allylation of 3-acetyl-2-oxindoles with allyl alcohol is performed using 3 mol% of Pd(dba)2, rac-BINAP and BINOL phosphoric acid as catalytic mixture. This procedure allows the in situ synthesis of 3-allyl-2-oxindole by adding Triton B to the reaction mixture. The deacylative allylation of 3-acetyl-3-methyl-2-oxindoles with allylicalcohols is carried out with 3 mol% of Pd(OAc)2, dppp and 1.5
使用3 mol%的Pd(dba)2,rac-BINAP和BINOL磷酸作为催化混合物,进行3-乙酰基-2-氧吲哚与烯丙醇的Pd催化烯丙基化反应。该方法允许通过将Triton B加入反应混合物中原位合成3-烯丙基-2-恶吲哚。用3mol%的Pd(OAc)2,dppp和1.5当量进行3-乙酰基-3-甲基-2-氧吲哚与烯丙基醇的脱酰基烯丙基化。LiO t Bu作为碱,以良好的产率提供了相应的3,3-二取代的2-氧吲哚。可以将两种方法结合起来用于制备不对称的3,3-二烯丙基化的2-氧吲哚,例如化合物7。DaA必须在无氧条件下进行,以避免竞争性形成3-烷基-3-羟基-2-吲哚。通过在室温下在空气中用LiOEt对3-烷基化的3-乙酰基-2-氧吲哚进行3-烷基化的3-乙酰基-2-氧吲哚的酰基化反应,可以容易地获得后面的化合物。
Development of catalytic deacylative alkylations (DaA) of 3-acyl-2-oxindoles: total synthesis of meso-chimonanthine and related alkaloids
作者:Nivesh Kumar、Mrinal Kanti Das、Santanu Ghosh、Alakesh Bisai
DOI:10.1039/c6cc10228j
日期:——
We present an effective deacylative alkylation strategy for the construction of a variety of 2-oxindoles bearing all-carbon quaternary center at the pseudobenzylic position. A wide variety of products with quaternary...
An Expedient Synthesis of Oxindole Dimers by Direct Oxidative Dimerization of Oxindoles
作者:Hyun Ju Lee、Sangku Lee、Jin Woo Lim、Jae Nyoung Kim
DOI:10.5012/bkcs.2013.34.8.2446
日期:2013.8.20
Oxindole dimers have been used as intermediates in the synthesis of various cyclotryptamine alkaloids. An efficient directsynthesis of oxindole dimers has been carried out from 3-substituted oxindolesvia an oxidative dimerization using manganese(III) acetate or copper acetate/silver acetate system.