摘要4-乙酰氧基-9-呋喃基萘并[ 2,3- b ]呋喃的酸催化再循环有效地产生了萘并[1,2- b: 3,4- b' ]二呋喃。另一方面,4-氨基萘[2,3- b ]呋喃没有经历类似的环化成苯并[ g ]呋喃[2,3- e ]吲哚。通过使用密度泛函理论计算来解释这两种类型的基材在行为上的差异。 图形概要
Furan ring opening–isochromene ring closure: a new approach to isochromene ring synthesis
作者:Alexander V. Butin、Vladimir T. Abaev、Vladimir V. Mel’chin、Artem S. Dmitriev
DOI:10.1016/j.tetlet.2005.09.056
日期:2005.11
A new approach toward the synthesis of 1H-isochromenes based on the recyclization of the furan ring in the corresponding ortho-hydroxymethylbenzylfurans is described.
描述了一种基于相应邻-羟甲基苄基呋喃中呋喃环的环化合成1 H-异色酮的新方法。
On the synthesis of 9-furylnaphtho[2,3-<i>b</i>]furan derivatives
作者:Vladimir V. Mel' chin、Alexander V Butin、Gennady D. Krapivin、Vladimir T. Abaev
DOI:10.1002/jhet.5570420727
日期:2005.11
A simple synthetic pathway to the unknown 9-furyl-substituted naphthofuran derivatives has been developed involving intramolecular cyclization of 2-carboxyaryldifurylmethanes and 2-formylaryldifuryl-methanes.
Synthesis and some transformations of new 9-furylnaphtho[2,3-b]furan derivatives
作者:Alexander V. Butin、Vladimir V. Mel'chin、Vladimir T. Abaev、Wolfgang Bender、Arkady S. Pilipenko、Gennady D. Krapivin
DOI:10.1016/j.tet.2006.06.027
日期:2006.8
The synthesis of a number of naphtho[2,3-b]furanderivatives, containing a furyl substituent in position 9 by intramolecular cyclization of 2-carboxy and 2-formylbis(5-alkylfur-2-yl)methanes is described. The reactivity of the title compounds in formylation, acetylation, nitration, and oxidation reactions has been investigated. It was shown that nitration of 2-methyl-9-(5-methyl-2-furyl)naphtho[2,3-b]furan-4-yl
描述了通过分子内2-羧基和2-甲酰基双(5-烷基呋喃-2-基)甲烷的分子环化反应合成许多在位置9处含有呋喃基取代基的萘并[2,3- b ]呋喃衍生物的方法。已经研究了标题化合物在甲酰化,乙酰化,硝化和氧化反应中的反应性。结果表明,硝化2-甲基-9-(5-甲基-2-呋喃基)萘并[2,3 - b ]呋喃-4-基乙酸盐会导致呋喃氧化开环而不是亲电取代。
A Furan Recyclization Reaction as a New Approach to Isochromenes
As part of our ongoing interest in the synthesis of benz-annelated heterocycles from O-substituted benzylfurans, recyclization of [ O-(hydroxymethyl)aryl]difurylmethanes was studied. It was shown that, under acidic conditions, the O-hydroxymethyl group in these compounds acts as a nucleophile and tetracyclic isochromene derivatives are formed via a recyclization-cyclization tandem sequence. Alternatively
Acid-catalyzed cascade rearrangement of 4-acetoxy-9-furylnaphtho[2,3-b]furans
作者:Alexander V. Fin’ko、Valery O. Babikov、Arkady S. Pilipenko、Vladimir T. Abaev、Igor V. Trushkov、Alexander V. Butin
DOI:10.1007/s00706-013-1075-7
日期:2013.11
AbstractAcid-catalyzed recyclization of 4-acetoxy-9-furylnaphtho[2,3-b]furans efficiently produced naphtho[1,2-b:3,4-b’]difurans. On the other hand, 4-aminonaphtho[2,3-b]furans failed to undergo the analogous recyclization into benzo[g]furo[2,3-e]indoles. The difference in behavior of these two types of substrates was explained by employing density functional theory calculations. Graphical abstract
摘要4-乙酰氧基-9-呋喃基萘并[ 2,3- b ]呋喃的酸催化再循环有效地产生了萘并[1,2- b: 3,4- b' ]二呋喃。另一方面,4-氨基萘[2,3- b ]呋喃没有经历类似的环化成苯并[ g ]呋喃[2,3- e ]吲哚。通过使用密度泛函理论计算来解释这两种类型的基材在行为上的差异。 图形概要