使用I 2 / H 2 O 2系统将2-烯丙基-1,3-二酮转化为包含1,2-二氧戊环和四氢呋喃环的双环化合物
摘要:
基于2-烯丙基-1,3-二酮与I 2 / H 2 O 2体系的反应,开发了一种一锅法用于组装包含1,2-二氧戊环和四氢呋喃环的双环化合物。为了选择性形成四氢呋喃二恶唑,需要5摩尔过量的H 2 O 2和2倍过量的I 2。这些结构复杂的分子的合成是不寻常的,因为它不产生预期的桥连四恶烷,将几个H 2 O 2分子加到羰基上的产物或双键碘代过氧化的产物。
Silicon-Controlled Allylation of 1,3-Dioxo Compounds by Use of Allyltrimethylsilane and Ceric Ammonium Nitrate
作者:Jih Ru Hwu、Chung Nan Chen、Shui-Sheng Shiao
DOI:10.1021/jo00109a016
日期:1995.2
A new method was developed for allylation of 1,3-diketones, beta-keto esters, and malonates. Treatment of those 1,3-dioxo compounds with allyltrimethylsilane (1.3 equiv) in the presence of eerie ammonium nitrate (2.1 equiv) in methanol at room temperature often gave the mono-C-allylated products in good to excellent yields (74-98%). These reactions, involving beta-carboradical and beta-carbocationic intermediates, were controlled by a silyl group. Replacement of eerie ammonium nitrate and methanol with manganese(III) acetate (2.4 equiv) and acetic acid afforded silicon-containing dihydrofurans in high yields at 80 degrees C.
Components and catalysts for the polymerization of olefins