Ultrasound Promoted Stereoselective Synthesis of 2,3-Dihydrobenzofuran Appended Chalcones at Ambient Temperature
作者:Vishnu A Adole、Bapu S Jagdale、Tansing B Pawar、Abhishek A Sagane
DOI:10.17159/0379-4350/2020/v73a6
日期:——
investigation, an ultrasoundpromoted the synthesis of a series of (E)-3-(2,3-dihydrobenzofuran 5-yl)-1-(aryl)prop2-en-1-one derivatives from 2,3-dihydrobenzofuran-5-carbaldehyde and various aromatic ketones under clean conditions. The application of ultrasound irradiation in organic reactions is one of the incredible tools of green chemistry as reactions can be carried out rapidly under neat conditions
在本研究中,超声促进了由2,3-二氢苯并呋喃合成一系列(E)-3-(2,3-二氢苯并呋喃5-基)-1-(芳基)prop2-en-1-one衍生物的过程清洁条件下的-5-甲醛和各种芳族酮。超声辐射在有机反应中的应用是绿色化学不可思议的工具之一,因为反应可以在干净的条件下快速进行。在超声辐射下以良好至优异的产率合成了新颖的(E)-3-(2,3-二氢苯并呋喃-5-基)-1-(芳基)丙-2-烯-1-酮查尔酮衍生物的文库。通过使用FT-IR,1 H NMR,C NMR和HRMS技术已经建立了本研究中合成的所有合成查耳酮衍生物的结构。查耳酮中C = C周围的立体化学通过1 H NMR证实是反式的(Jab = 15.5Hz)。
Microwave-Assisted Condensation Reactions of Acetophenone Derivatives and Activated Methylene Compounds with Aldehydes Catalyzed by Boric Acid under Solvent-Free Conditions
We here disclosed a new protocol for the condensation of acetophenone derivatives and active methylene compounds with aldehydes in the presence of boricacid under microwave conditions. Implementation of the reaction is simple, healthy and environmentally friendly owing to the use of a non-toxic catalyst coupled to a solvent-free procedure. A large variety of known or novel compounds have thus been
[4+2] Annulation of Vinyl Ketones Initiated by a Phosphine-Catalyzed Aza-Rauhut-Currier Reaction: A Practical Access to Densely Functionalized Tetrahydropyridines
作者:Zugui Shi、Qinjie Tong、Wendy Wen Yi Leong、Guofu Zhong
DOI:10.1002/chem.201201318
日期:2012.8.6
The first example of phosphine catalyzed aza‐Rauhut–Currier reaction initiated [4+2] annulation of vinyl ketones with N‐sulfonyl‐1‐aza‐1,3‐dienes has been disclosed. Under the ambient conditions, this protocol provides a practical access to valuable densely functionalized tetrahydropyridines in good to excellent yields and high diastereoselectivities (see scheme).