报道了 malbrancheamide 和 malbrancheamide B 的仿生全合成。两种一氯物质的合成使得 Malbrancheamide B 的结构能够被明确指定。这些合成均以 5-羟基吡嗪-2(1 H )-one 的分子内 Diels-Alder 反应为特征,以构建双环[2.2.2]二氮杂辛烷核心,这也被提议作为这些化合物的生物合成途径。
diacetate mediated method for selective chlorination, bromination, and iodination of indole C–H bonds using sodium halide as a source for analogous halogenations. The combination of NaX and phenyliodine diacetate provides an invincible system for halogenation of indoles. This protocol was compatible with a wide array of indole substrates and provides straight forward access to potential halogenated arenes
Ni–NiO heterojunctions: a versatile nanocatalyst for regioselective halogenation and oxidative esterification of aromatics
作者:Nivedita Bhardwaj、Ajit Kumar Singh、Nancy Tripathi、Bharat Goel、Arindam Indra、Shreyans K. Jain
DOI:10.1039/d1nj02777h
日期:——
Ni–NiO nanoparticles catalyzed the oxidative esterification of carbonylcompounds with alcohol, diol or dithiol in the presence of a catalytic amount of NBS. It was observed that the aromaticcarbonyls substituted with an electron-donating group favoured nuclear halogenation, whereas an electron-withdrawing group substitution in carbonylcompounds facilitated the oxidation reaction. In addition, the catalyst
Decarboxylative halogenation of indoles by vanadium haloperoxidases
作者:Lauren J. Harstad、Clare E. Wells、Hyung Ji Lee、Lauren P. T. Ramos、Manik Sharma、Cameron A. Pascoe、Kyle F. Biegasiewicz
DOI:10.1039/d3cc04053d
日期:——
Halogenated heteroarenes are key building blocks across numerous chemical industries. Here, we report that vanadium haloperoxidases are capable of producing 3-haloindoles through decarboxylative halogenation of 3-carboxyindoles. This biocatalytic method is applicable to decarboxylative chlorination, bromination, and iodination in moderate to high yields and with excellent chemoselectivity.
Efficient electrochemical cleavage of N,N-dimethylaminosulfonyl-protected indoles
作者:Martine Largeron、Brid Farrell、Jean-François Rousseau、Maurice-Bernard Fleury、Pierre Potier、Robert H Dodd
DOI:10.1016/s0040-4039(00)01504-5
日期:2000.12
Indoles protected at the N-1 position with the N,N-dimethylaminosulfonyl group were efficiently deprotected by electrolysis. Yields were in the 80-90% range and the method was compatible with a number of functional groups (nitrile, ester, chloride, carboxamide). (C) 2000 Elsevier Science Ltd. All rights reserved.
Biomimetic Total Synthesis of Malbrancheamide and Malbrancheamide B
作者:Kenneth A. Miller、Timothy R. Welch、Thomas J. Greshock、Yousong Ding、David H. Sherman、Robert M. Williams
DOI:10.1021/jo800116y
日期:2008.4.1
The biomimetic total syntheses of both malbrancheamide and malbrancheamide B are reported. The synthesis of the two monochloro species enabled the structure of malbrancheamide B to be unambiguously assigned. The syntheses each feature an intramolecular Diels−Alder reaction of a 5-hydroxypyrazin-2(1H)-one to construct the bicyclo[2.2.2]diazaoctane core, which has also been proposed as the biosynthetic
报道了 malbrancheamide 和 malbrancheamide B 的仿生全合成。两种一氯物质的合成使得 Malbrancheamide B 的结构能够被明确指定。这些合成均以 5-羟基吡嗪-2(1 H )-one 的分子内 Diels-Alder 反应为特征,以构建双环[2.2.2]二氮杂辛烷核心,这也被提议作为这些化合物的生物合成途径。