本文描述了一种空前的路易斯酸,其通过炔丙基炔醇与2-乙烯基苯酚的环加成反应,催化了有价值的3,4-二氢-2 H -2,4-甲烷二甲基苯并没有保护性地进行了高效合成。该环加成方案可耐受多种官能团,以令人满意的收率提供实用,通用且经济实惠的途径来获得新型的有吸引力的桥环产品。与报道的桥环骨架合成反应条件相比,目前的反应条件是中性,温和且没有任何添加剂。
Deep eutectic solvent-catalyzed Meyer–Schuster rearrangement of propargylic alcohols under mild and bench reaction conditions
作者:Nicolás Ríos-Lombardía、Luciana Cicco、Kota Yamamoto、José A. Hernández-Fernández、Francisco Morís、Vito Capriati、Joaquín García-Álvarez、Javier González-Sabín
DOI:10.1039/d0cc06584f
日期:——
The Meyer–Schuster rearrangement of propargylic alcohols into α,β-unsaturated carbonyl compounds has been revisited by setting up an atom-economic process catalyzed by a deep eutectic solvent FeCl3·6H2O/glycerol. Isomerizations take place smoothly, at room temperature, under air and with short reaction times. The unique solubilizing properties of the eutectic mixture enabled the use of a substrate
通过建立由低共熔溶剂FeCl 3 ·6H 2 O /甘油催化的原子经济过程,重新探讨了炔丙醇向α,β-不饱和羰基化合物的Meyer-Schuster重排。异构化可在室温,空气,短反应时间内平稳进行。低共熔混合物独特的增溶性能使其能够使用浓度高达1.0 M的底物,并且将介质循环使用多达十次,而不会损失任何催化活性。
A facilesynthesis of highly substituted as well as conjugated unsymmetrical azines via the reaction of propargyl alcohols and isatin hydrazones in the presence of iodine is demonstrated under open to air. A series of unsymmetrical azines have been synthesized with excellent yields from simple and readily available starting materials in a complete stereoselective manner.
Reaction of Indole Carboxylic Acid/Amide with Propargyl Alcohols: [4 + 3]-Annulation, Unexpected 3- to 2- Carboxylate/Amide Migration, and Decarboxylative Cyclization
作者:Karuppu Selvaraj、Shubham Debnath、K. C. Kumara Swamy
DOI:10.1021/acs.orglett.9b01686
日期:2019.7.19
indole-2-carboxylic acids/amides form fused seven-membered lactones/lactams (oxepinoindolones/azepinoindolones) upon treatment with substituted propargyl alcohols using catalytic Cu(OTf)2. Decarboxylative cyclization of 1-methylindole-2- or indole-3-carboxylic acids with substituted propargyl alcohols under Lewis (for 1-methylindole-2-carboxylic acid) or Brønsted (for 1-methylindole-3-carboxylic acid) acid catalysis
Synthesis of 2-(Isoquinolin-1-yl)prop-2-en-1-ones via Silver(I)-Catalyzed One-Pot Tandem Reaction of <i>ortho</i>-Alkynylbenzaldoximes with Propargylic Alcohols
作者:Ali Nikbakht、Saeed Balalaie、Bernhard Breit
DOI:10.1021/acs.orglett.9b02952
日期:2019.9.20
The silver(I)-catalyzed reaction of ortho-alkynylbenzaldoximes with propargylic alcohols represents a new strategy for the divergent one-pot synthesis of 2-(isoquinolin-1-yl) prop-2-en-1-ones viatandem 6-endo-cyclization, 1,3-dipolar cycloaddition, and intramolecular dehydrative opening of the 2,3-dihydroisoxazole ring. This synthetic protocol tolerates a wide variety of ortho-alkynylbenzaldoximes
expedient method was demonstrated for the synthesis of 3‐alkenyl‐3‐amino‐2‐oxindoles from readily available propargylic alcohols and isatin imines in the presence of BF3 ⋅ Et2O as a catalyst under open‐air atmosphere. The above reaction was time‐dependent and further extended to the one‐pot synthesis of highly substituted spiro‐indeneindolones via 1,3‐amino group migration/Friedel‐Crafts cyclization. This