An efficient method for syntheses of functionalized 6-bulkysubstituted salicylates under microwave irradiation
作者:Ren-Yu Qu、Yu-Chao Liu、Qiong-You Wu、Qiong Chen、Guang-Fu Yang
DOI:10.1016/j.tet.2015.08.040
日期:2015.10
synthase (AHAS), an important target for herbicide discovery. These two inhibitors contain 6-arylsalicylate skeleton. Previously, we have explored a new method to synthesize position-6 aryl substituted salicylic acid fragment. However, this method failed to synthesize 4-methyl-6-aryl salicylic acids. Herein, we developed a new efficient method for the synthesis of functionalized 4-methyl-6-bulkyarylsalicylates
The formal [3+3] cyclization of 1,3-bis(silyloxy)buta-1,3-dienes with 1-aryl-3-ethoxyprop-2-en-1-ones, available by Heck reaction of benzoyl chlorides with ethyl vinyl ether, afforded a variety of 6-arylsalicylates. The reaction of the products with concentrated sulfuric acid resulted in the formation of fluorenones. 6-Alkylsalicylates were prepared by cyclization of 1,3-bis(silyloxy)buta-1,3-dienes
Efficient synthesis of functionalized 6-arylsalicylates via microwave-promoted Suzuki cross-coupling reaction
作者:Yu-Chao Liu、Zhi-You Huang、Qiong Chen、Guang-Fu Yang
DOI:10.1016/j.tet.2013.08.033
日期:2013.10
Functionalized 6-arylsalicylate substructures occur in a variety of pharmacologically relevant natural products and bioactive compounds. They are also broadly used as important intermediates in organic synthesis. Traditional synthetic methods have suffered from some drawbacks, such as relatively harsh reaction conditions, narrow range of substrates, and poor yields. Utilizing microwave irradiation, the synthesis of functionalized 6-arylsalicylates via a Suzuki cross-coupling has been developed with a wide range of substrates. Almost all the reactions proceeded smoothly and afforded moderate to excellent yields of products, which indicated that electronic effects and steric modifications have little effect on this reaction. (C) 2013 Elsevier Ltd. All rights reserved.
Anticancer agent synthesis designed by artificial intelligence: Pd(OAc)2-catalyzed one-pot preparation of biphenyls and its application to a concise synthesis of various diazofluorenes
作者:Tetsuhiko Takabatake、Hiroki Tomita、Syo Okada、Natsumi Hayashi、Takashi Masuko、Masahiro Toyota
DOI:10.1016/j.tetlet.2020.152267
日期:2020.9
9-diazo-1-methoxy-9H-fluorene, which inhibits the proliferation of HeLa cells, was achieved in reasonable chemical yield. In addition, various diazofluorenes were synthesized using the above protocol and their antitumor effects were evaluated. As a result, several novel diazofluorenes, which have a stronger cytotoxic activity than cisplatin against various human epithelial cancer cells, were found.
Gold-Catalyzed Cycloaromatization of 2,4-Dien-6-yne Carboxylic Acids: Synthesis of 2,3-Disubstituted Phenols and Unsymmetrical Bi- and Terphenyls
作者:Patricia García-García、Manuel A. Fernández-Rodríguez、Enrique Aguilar
DOI:10.1002/anie.200901269
日期:2009.7.13
Round numbers: A gold‐catalyzed 2,7‐cycloaromatization of captodative dienyne carboxylicacids has been developed that occurs at room temperature with low catalyst loading and total regioselective control (see scheme). The reaction is totally dependent on the electronic properties of the dienyne acid: if a strong electron‐donating group is not directly linked to the triple bond, a 1,6‐cyclization/decarboxylation