Thermal treatment of 1, 2-dihydroindol-3-ones (2) with allyl alcohols (3) in the presence of camphorsulfonic acid and magnesium sulfate advances a sequence of condensation and Claisen rearrangement to give 1, 2-dihydro-2-allylindol-3-ones (6) including 2-(1, 1-dimethylallyl) derivatives (1).
作者:Chunyu Wang、Zhonglei Wang、Xiaoni Xie、Xiaotong Yao、Guang Li、Liansuo Zu
DOI:10.1021/acs.orglett.7b00591
日期:2017.4.7
The first total synthesis of the opened-type Kopsia alkaloid grandilodine B is reported. Four stereocenters of this alkaloid, three of them quaternary, are stereoselectively generated by a Diels–Alder reaction, a diastereoselective cyanation of tertiary alcohol, and a facial-selective nitrone 1,3-dipolar cycloaddition.
Preparation of Alkyl Di(<i>p</i>-tolyl)sulfonium Salts and Their Application in Metal-Free C(sp<sup>3</sup>)–C(sp<sup>3</sup>) and C(sp<sup>3</sup>)–C(sp<sup>2</sup>) Bond Formations
Alkyldiarylsulfonium salts were synthesized by a combination of active sulfonium species, prepared through the activation of diarylsulfoxide, and alkyl nucleophiles. The isolated sulfonium salts were subjected to the allylation and cyclopropanation of the active methylene compounds and metal-free C(sp3)–C(sp2) couplings via oxyallyl cation intermediates under mild conditions. The series of reactions
products. Its light-absorption properties make it useful for the design of functional molecules. However, versatile synthesis methods have not yet been reported. In this report, we present a versatile synthetic method for pseudoindoxyls using the direct S0 → Tn transition under visiblelight irradiation. We also discuss the application of pseudoindoxyls as photocatalysts.
假吲哚酚是在各种天然产物中发现的部分骨架。其光吸收特性使其可用于功能分子的设计。然而,通用的合成方法尚未见报道。在本报告中,我们提出了一种在可见光照射下利用直接 S 0 → T n跃迁合成假吲哚酚的通用方法。我们还讨论了假吲哚酚作为光催化剂的应用。
Chien, Chun-Sheng; Hasegawa, Atsushi; Kawasaki, Tomomi, Chemical and pharmaceutical bulletin, 1986, vol. 34, # 4, p. 1493 - 1496