Direct carboxylation of allylic halides with carbon dioxide in the presence of indium
作者:Bukeyan Miao、Shengming Ma
DOI:10.1039/c4cc00148f
日期:——
A highly regioselective indium-mediated allylation of carbon dioxide starting from simple allylic halides (X = I, Br, Cl) has been developed. No transition metal catalyst is needed and an inert atmosphere is not necessary. The reaction tolerates a wide range of synthetically attractive functional groups with a very high branched regioselectivity.
一种高区域选择性的铟介导的二氧化碳烯丙基化反应已被开发,该反应以简单的烯丙卤化物(X = I, Br, Cl)为起始物。不需要过渡金属催化剂,也不需要惰性气氛。该反应能够耐受广泛的合成上具有吸引力的功能团,并具有非常高的支化区域选择性。
Tin Powder-Promoted Cascade Condensation/Allylation/Lactamization: Synthesis of Isoindolinones and Pyrazoloisoindol-8-ones
作者:Xiaoping Wang、Danfeng Huang、Ke-Hu Wang、Yingpeng Su、Yulai Hu
DOI:10.1021/acs.joc.9b00733
日期:2019.6.7
An efficient tinpowder-promoted cascade condensation/allylation/lactamization of 2-formylbenzoic acids, hydrazides, and allyl bromides was developed for the synthesis of isoindolinones in good to excellent yields under mild conditions without any other additives or catalysts. Further manipulation of isoindolinones by iodocyclization process afforded the tricyclic tetrahydro-8H-pyrazolo[5,1-a]isoindol-8-one
已开发出一种有效的锡粉促进的2-甲酰基苯甲酸,酰肼和烯丙基溴的级联缩合/烯丙基化/内酰胺化反应,可在温和条件下以良好至极佳的收率合成异吲哚啉酮,而无需任何其他添加剂或催化剂。通过碘环化过程进一步操作异吲哚啉酮,得到三环四氢-8 H-吡唑并[5,1- a ] isoindol -8-one衍生物,可以将其转化为更复杂的四环四氢-4 H -azirino [1',2' :2,3] pyrazolo [5,1- a ] isoindol-4-ones。
Tin powder‐promoted oxidation/allylation of glycine esters: Synthesis of
<i>γ</i>
,
<i>δ</i>
‐unsaturated
<i>α</i>
‐amino acid esters
作者:Pengfei Zhao、Danfeng Huang、Feng Wang、Tongyu Han、Ming Yang、Ke‐Hu Wang、Yulai Hu
DOI:10.1002/aoc.6479
日期:2022.1
An efficient tin powder-promoted oxidation/allylation reaction of glycine esters with allylbromides is developed, which affords γ,δ-unsaturated α-amino acid esters under mild conditions without any other transition metal catalysts. This method avoids the use of unstable imine as starting material, and provides an efficient method for synthesis of γ,δ-unsaturated α-amino acid esters and α-methylene-γ-lactam
The cascade coupling/iodoaminocyclization reaction of trifluoroacetimidoyl chlorides and allylamines: metal-free access to 2-trifluoromethyl-imidazolines
coupling/iodoaminocyclization reaction for the rapid assembly of 2-trifluoromethyl-imidazolines has been disclosed. The transformation applies readily accessible trifluoroacetimidoyl chlorides, allylamines and N-iodosuccinimides as the starting substrates, achieving an efficient and straightforward pathway to construct diverse imidazoline derivatives. Excellent efficiency of the reaction is observed (higher
Synthesis of dihydroquinoxalin-2(1H)-ones by tin powder-promoted di- and mono-allylation of quinoxalin-2(1H)-ones
作者:Zhoubin Deng、Tianyu Yang、Ke-Hu Wang、Wenxuan Xue、Danfeng Huang、Pengfei Li、Junjiao Wang、Yingpeng Su、Yulai Hu
DOI:10.1016/j.tet.2020.131185
日期:2020.5
An efficient method of tin powder-promoted di- and mono-allylation of quinoxalin-2(1H)-ones has been developed, which provides a practical route for the synthesis of dihydroquinoxalin-2(1H)-one derivatives in good yields. This protocol uses the combination of allylbromides and tin powder to replace the traditional allylstannanes to make the organotin-participated process less toxic, and has the advantages