Polyketide syntheses: condensations of keto esters with anionic electrophiles
作者:T. M. Harris、T. P. Murray、C. M. Harris、M. Gumulka
DOI:10.1039/c39740000362
日期:——
Condensation of multiple anions of acetoacetic and 3,5-dioxohexanoic esters with monoanions of β-ketoesters and β-keto-aldhydes provide a new approach to β-polyketo-esters and related products having biosynthetic significance.
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
Synthesis of Functionalized Biaryls Based on a Heck Cross-Coupling-[3+3] Cyclization Strategy
作者:Peter Langer、Gerson Mroß、Helmut Reinke
DOI:10.1055/s-2008-1072654
日期:——
6-Arylsalicylates were regioselectively prepared by formal [3+3] cyclization of 1,3-bis(silyloxy)-1,3-butadienes with 1-aryl-3-ethoxyprop-2-en-1-ones which are available by Heck reaction of benzoyl chlorides with ethylvinyl ether. In this context, the first [3+3] cyclizations of brominated substrates are reported.
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
Convenient Synthesis of <i>N</i>-Benzyl-1,4-dihydropyridines, Cyclohexenones, and Bicyclo[3.3.1]nonan-3-one Derivatives from 1-Aza-1,3-butadienes
作者:Jon K. F. Geirsson、Jonina F. Johannesdottir
DOI:10.1021/jo960942f
日期:1996.1.1
Readily available 1-aza-1,3-butadienes (enimines) react with methyl acetoacetate and acetylacetone in the presence of catalytic amounts of lithium iodide to form in high yields unsymmetricallysubstituted1,4-dihydropyridines or cyclohexenones. The reaction pathway depends on the structure of the enimine used. This divergence was not observed when the enimines were reacted with dimethyl 1,3-acetonedicarboxylate