Synthesis of 1,4-dihydro-benzo[d][1,3]oxazin-2-ones from phthalides via an aminolysis-Hofmann rearrangement protocol
摘要:
A simple two-step procedure for the conversion of readily available phthalides to the corresponding benzoxazinones was developed. Initial ring-opening aminolysis to form a primary 2-hydroxymethylbenzamide, followed by reaction with bis(trifluoroacetoxy)iodobenzene (BTI) conveniently, provided a variety of 4-substituted benzoxazinones. Published by Elsevier Ltd.
Synthesis of synthons: The asymmetric hydrogenation and subsequent in situ lactonization with Ru-diphosphines results in the direct conversion of a series of 2-acylarylcarboxylates including 2-aroylarylcarboxylates into the corresponding optically active 3-substituted phthalides under mild reaction conditions.
Electron-Transfer-Induced Intramolecular Heck Carbonylation Reactions Leading to Benzolactones and Benzolactams
作者:Ilhyong Ryu、Takahide Fukuyama、Takanobu Bando
DOI:10.1055/s-0037-1609964
日期:2018.8
Radical Methods and their Strategic Applications in Synthesis Abstract A metal-catalyst-free intramolecular Heck carbonylationreaction of benzyl alcohols and benzyl amines with carbonmonoxide under heating at 250 °C affords the corresponding benzolactones and benzolactams in good to excellent yields. A hybrid radical/ionic chain mechanism, involving electron transfer from radical anions generated by nucleophilic
Cu-MEDIATED ANNULATION FOR THE EFFECTIVE SYNTHESIS OF 3-SUBSTITUTED PHTHALIDES
申请人:Council of Scientific & Industrial Research
公开号:US20150045564A1
公开(公告)日:2015-02-12
The present invention disclosed herein is a novel commercially feasible, one pot synthesis of library of 3-substituted phthalides of formula I via CuCN mediated oxidative cyclization in high yield. Formula I
An improved method for the synthesis of γ-lactones using sodium bromate and sodium hydrogen sulfite
作者:Safdar Hayat、Atta-ur-Rahman、M.Iqbal Choudhary、Khalid Mohammed Khan、Ernst Bayer
DOI:10.1016/s0040-4039(00)02341-8
日期:2001.2
two-phase system using ethyl acetate as solvent, under mild conditions to give the corresponding cyclized phthalides in moderate to satisfactory yield. Intermediately the α-brominated alkylbenzenecarboxylic acids are formed by the in situ generated hypobromous acid. These α-brominated acids undergo an intramolecular nucleophilic substitution reaction to afford the corresponding γ-lactones.
Synthesis of 1,2-phenylenedimethanols by base-promoted reduction of isobenzofuran-1(3H)-ones with silane
作者:Bin Liu、Xigeng Zhou
DOI:10.1016/j.cclet.2018.11.025
日期:2019.3
Abstract An efficient method for preparation of substituted 1,2-phenylenedimethanols and aliphatic 1,4-diols that are valuableintermediates in organic synthesis, has been developed by the base-promoted reduction of isobenzofuran-1(3H)-ones and γ-lactones with silane under mild conditions. Compared with traditional procedures using stoichiometric amounts of metal hydrides and alkyl reductants, the