Synthesis of phthalides from bis-propargyl ethers: use of Garratt–Braverman cyclization to construct the phthalans and IBX as a new reagent for subsequent oxidation
作者:Arpita Panja、Eshani Das、Manasi Maji、Amit Basak
DOI:10.1016/j.tetlet.2015.09.036
日期:2015.10
An efficient route to phthalides is described starting from easily available bis-propargyl ethers. The method involves Garratt-Braverman cyclization of the ethers to phthalans which are then efficiently oxidized to the phthalides by iodoxy benzoic acid (IBX) which has been shown to be a superior reagent in terms of yield and reagent stoichiometry for such a transformation in comparison with more commonly used KMnO4/CuSO4 reagent. (C) 2015 Elsevier Ltd. All rights reserved.
Concise Synthesis of Arylnaphthalene Lignans by Regioselective Intramolecular Anionic Diels-Alder Reactions of 1,7-Diaryl-1,6-diynes
Total synthesis of phyllamycin A and C, justicidin B, and retrojusticidin B from simple arylalkynyl alcohols and (3,4-methylenedioxyphenyl)propynal was accomplished in 4–5 steps by employing an intramolecular anionic Diels–Alder reaction as the key step.
通过采用分子内阴离子 Diels-Alder 反应作为关键步骤,从简单的芳炔醇和(3,4-亚甲基二氧苯基)丙炔醛全合成 phyllamycin A 和 C、justicidin B 和反杀虫素 B 分 4-5 步完成。