Decarboxylative transformations of paraconicacids, a class of γ-butyrolactones containing a carboxylic acid group at the β-position as their characteristic functionality, by using a combination of AgNO3/K2S2O8 were investigated. The dual function of AgNO3 as an initiator of the decarboxylation process and as a source of nitrogen dioxide radicals that react with aliphatic carboxylic substrates is reported
通过使用AgNO 3 /K 2 S 2 O 8的组合,研究了对康酸(一类在β-位含有羧酸基团作为其特征官能团的γ-丁内酯)的脱羧转化。AgNO 3的双重功能作为脱羧过程的引发剂和作为与脂肪族羧酸底物反应的二氧化氮自由基的来源首次被报道。从仲康酸开始,在一锅操作中以中等的选择性获得了良好的综合收率 (41-85%) 的 β-硝基和 β-羟基 γ-丁内酯。在γ-丁内酯核可耐受的温和条件下,反应在可接受的反应时间(两小时)内完成。本研究提供了对 β-硝基和 β-羟基 γ-丁内酯的直接和位点特异性入口,它们是有机转化中的重要前体。
A short access to highly strained spiranic compounds from ethyl 3-cyclobutylprop-2-enoate
作者:Hani Salim、Olivier Piva
DOI:10.1016/j.tetlet.2008.02.172
日期:2008.4
irradiation of ethyl 3-cyclobutylpropen-2-oate delivered the β,γ-unsaturated isomer in high yield. Its CC double bond was submitted to epoxidation and cyclopropanation to deliver the corresponding spiro[3.2]hexane derivatives. Alternatively, the same substrate treated by TMS–I or by OsO4 allowed an easy access to two spiranic butyrolactones.