Oxidative Cyclization of β,γ-Unsaturated Carboxylic Acids Using Hypervalent Iodine Reagents: An Efficient Synthesis of 4-Substituted Furan-2-ones
作者:Kensuke Kiyokawa、Satoshi Minakata、Kenta Takemoto、Shunsuke Yahata、Takumi Kojima
DOI:10.1055/s-0036-1588987
日期:2017.7
Published as part of the Special Topic Modern Strategies with Iodine in Synthesis� Abstract The oxidative cyclization of β-substituted β,γ-unsaturated carboxylic acids using a hypervalent iodine reagent to provide 4-substituted furan-2-one products, is reported. In this cyclization, the use of a highly electrophilic PhI(OTf)2, which is in situ prepared from PhI(OAc)2 and Me3SiOTf, is crucial. Depending
Preparation and reactions of 3,4-bisstannyl-2(5H)furanones
作者:Neil B Carter、Ross Mabon、Alexandre M.E Richecœur、J.B Sweeney
DOI:10.1016/s0040-4020(02)00995-x
日期:2002.10
Bistributylstannyl-2(5H)-furanone 4a has been prepared from 3-(tetrahydropyran-2-yl)oxy but-2-ynoate and shown to exhibit good selectivity in its Stille reactions with a range of halogenated compounds, leading to 4-substituted-3-stannyl-2(5H)-furanones, in generally moderate yield. Under certain reaction conditions, doubly substituted products were also isolated from the reactions. The 3,4-bistrimethylstannyl
Treatment of ß-aryl- or ß-alkylcrotonic esters with selenium dioxide in acetic acid in the presence of a catalytic amount of perchloric acid gave 4-substituted 2(5H)-furanones in moderate to good yields.
The Pd(0)-catalyzed cross coupling between 4-bromo-2(5H)-furanones and arylboronic acids provides the corresponding 4-aryl-2(5H)-furanones in yields of 61-85%. By using this method in conjunction with furanolate chemistry, the marine antibiotics rubrolide C and E have been synthesized in highly efficient fashion (4 steps, overall yield = 61 and 56% respectively) from beta-tetronic acid. (C) 1998 Elsevier Science Ltd. All rights reserved.
Butenolide annelation using a manganese(III) oxidation. A synthesis of 4-arylfuran-2(5H)-ones
作者:Ayhan S Demir、Nurettin Camkerten、Zuhal Gercek、Nese Duygu、Omer Reis、Elif Arikan
DOI:10.1016/s0040-4020(99)00036-8
日期:1999.2
A general procedure was developed for the annelation of a butenolide to an aromatic ketone that highlighted a manganese(III) oxidation of aromatic ketones. The oxidation of aromatic ketones with manganese(III) acetate in the presence of 2-bromoacetic acid or the Mn(II) salt of this carboxylic acid provided a regioselectively convenient synthesis of 2-(2-bromoacetoxy) ketones. An Arbuzov or Wittig reaction