Hydroiodination-Triggered Cascade Reaction with I<sub>2</sub>
/PPh<sub>3</sub>
/H<sub>2</sub>
O: Metal-Free Access to 3-Substituted Phthalides from 2-Alkynylbenzoates
作者:Shin-ichi Kawaguchi、Kentaro Nakamura、Kotaro Yamaguchi、Yuki Sato、Yuhei Gonda、Masaaki Nishioka、Motohiro Sonoda、Akihiro Nomoto、Akiya Ogawa
DOI:10.1002/ejoc.201700839
日期:2017.10.2
synthesis of phthalides are strongly desired. Herein, we describe the metal-free synthesis of 3-substituted phthalides by the reductive hydroiodination of 2-alkynylbenzoates through an I2/PPh3/H2O-triggered cascade reaction. A variety of 3-substituted phthalides were synthesized in excellent yields by a one-pot reaction involving four processes: desilylation, hydroiodination, cyclization, and reduction.
邻苯二甲酰胺是在几种生物活性化合物中发现的重要支架。因此,强烈需要有效的合成邻苯二甲酰亚胺的方法。在这里,我们描述了通过I 2 / PPh 3 / H 2 O引发的级联反应,通过2-炔基苯甲酸酯的还原性加氢碘化反应,合成了无金属的3-取代的邻苯二甲酸酯。通过一锅法反应,涉及四个过程:去甲硅烷基化,加氢碘化,环化和还原反应,以优异的产率合成了多种3-取代的邻苯二甲酸酯。