Synthesis of 3-iodothiophenes via iodocyclization of (Z)-thiobutenynes
摘要:
A simple synthesis of 3-iodothiophenes was demonstrated using a wide range of (Z)-thioenynes. The key step in the iodocyclofunctionalization was the selective reduction of the triple bond in (Z)-thioenynes by the addition of iodine as an electrophilic agent. The 3-iodothiophenes were obtained in good to excellent yields of 61-92%. The 3-iodothiophenes were used as substrates in Sonogashira cross-coupling reactions to obtain thiophene acetylenes. (C) 2013 Elsevier Ltd. All rights reserved.
Green synthesis of halogenated thiophenes, selenophenes and benzo[b]selenophenes using sodium halides as a source of electrophilic halogens
作者:Tanay Kesharwani、Krystal A. Giraudy、Jordan L. Morgan、Cory Kornman、Abayomi D. Olaitan
DOI:10.1016/j.tetlet.2017.01.007
日期:2017.2
Herein, we report the first synthesis of chlorinated benzo[b]selenophenes via environmentally friendly electrophilic chlorocyclization reaction using "table salt" as a source of "electrophilic chlorine" and ethanol as a solvent. In addition, the synthesis of diverse halogenated heterocycles, including 3-chloro, 3-bromo and 3-iodo thiophenes, selenophenes, and benzo[b]selenophenes was successfully accomplished
Improvement in the synthesis of (Z)-organylthioenynes via hydrothiolation of buta-1,3-diynes: a comparative study using NaOH or TBAOH as base
作者:Amanda S. Santana、Diego B. Carvalho、Nadla S. Casemiro、Gabriela R. Hurtado、Luiz H. Viana、Nájla M. Kassab、Sandro L. Barbosa、Francisco A. Marques、Palimécio G. Guerrero、Adriano C.M. Baroni
DOI:10.1016/j.tetlet.2012.08.003
日期:2012.10
Hydrothiolation of symmetrical and unsymmetrical buta-1,3-diynes with sodium organylthiolate anions in reflux, generated in situ by reacting C4H9SH with NaOH, afforded (Z)-organylthioenynes in low to good yields (25-80%). By using tetrabutylammonium hydroxide (TBAOH) as base instead of NaOH, the hydrothiolation of buta-1,3-diynes was more rapid and efficient, providing (Z)-organylthioenynes in good to excellent yields (70-95%). (C) 2012 Elsevier Ltd. All rights reserved.
A study on the cellular and cytotoxic effects of S and Se heterocycles on the myeloid leukemia cell line PLB-985
作者:Niccole Auld、Krystal Flood、Tanay Kesharwani、Peter J. Cavnar