Highly regioselective lithiation of inter-ring carbon of bis(thien-2yl)methane: a general meso-elaboration protocol
摘要:
Bis(thien-2yl)methane is regioselectively lithiated at the inter-ring methylene carbon using dimsyl anion in THF at 0 degrees C: quenching with appropriate electrophile furnishes meso-elaborated derivatives, exclusively with synthetic advantage. (C) 2010 Elsevier Ltd. All rights reserved.
Highly regioselective lithiation of inter-ring carbon of bis(thien-2yl)methane: a general meso-elaboration protocol
作者:Kamaljit Singh、Amit Sharma
DOI:10.1016/j.tet.2010.03.075
日期:2010.5
Bis(thien-2yl)methane is regioselectively lithiated at the inter-ring methylene carbon using dimsyl anion in THF at 0 degrees C: quenching with appropriate electrophile furnishes meso-elaborated derivatives, exclusively with synthetic advantage. (C) 2010 Elsevier Ltd. All rights reserved.
Regioselective, Direct<i>meso</i>-Functionalization of Sulfur-Bridged 5,16-Dihydro[22]annulene(2.1.2.1)
The direct incorporation of task-specific substituents exclusively at the meso positions of neutral sulfur-bridged 5,16-dihydro[22]annulene(2.1.2.1) is described. This method allows for the incorporation of long hydrocarbon chains, which are otherwise not easily accessible through a conventional aldehyde condensation approach.