Clean and Efficient Iodination of Thiophene Derivatives
作者:Frédéric Gohier、Jérémie Grolleau、Pierre Frère
DOI:10.1055/s-0035-1560480
日期:——
Abstract Iodination of thiophene derivatives is realized using a simple, fast, and efficient methodology. Iodination of thiophene and 2- or 3-substituted or 3,4-disubstituted thiophenes with N-iodosuccinimide (NIS) activated with 4-toluenesulfonic acid in ethanol gives pure iodinated products that require no further purification. Iodination of thiophene derivatives is realized using a simple, fast
Intramolecular cyclisation of functionalised heteroaryllithiums. Synthesis of novel indolizinone-based compounds
作者:Javier Ruiz、Esther Lete、Nuria Sotomayor
DOI:10.1016/j.tet.2006.04.057
日期:2006.6
The intramolecular cyclisation of heteroaryllithiums derived from N-heteroarylmethylpyrrole-2-carboxam ides takes place smoothly at low temperature when N-methoxy-N-methyl and morpholine amides are used as internal electrophiles. Halogen-lithium exchange using n-BuLi is the method of choice to achieve metalation on the quinoline and pyridine derivatives, while directed lithiation (LDA) works better for furan. In the case of thiophene both methodologies can be applied. These metalation-cyclisation sequences provide a useful entry to several types of indolizidine based compounds (pyrrolo[1,2-b]acridinones, pyrrolo[1,2-g]quinolones, thieno and furo[3,2-f]indolizinones). (c) 2006 Elsevier Ltd. All rights reserved.
GRONOWITZ S .; DAHLGREN T., CHEM. SER., 1977, 12, NO 2-3, 57-67