Synthesis and properties of Oligo-6-(2-thienyl)pentafulvenes
摘要:
Oligo-6-(2-thienyl)pentafulvenes, synthesized up to a tetramer by application of a new pentafulvene synthesis, show considerably low reduction potentials to suggest ready formation of polyanions or polyanion radicals with oligoacetylene spines.
Broad Scope [4 + 2] Cycloaddition of <i>o</i>-Carboryne with Pentafulvenes Using 1-Li-2-OTf-<i>o</i>-C<sub>2</sub>B<sub>10</sub>H<sub>10</sub> as Precursor
作者:Jie Zhang、Zaozao Qiu、Zuowei Xie
DOI:10.1021/acs.organomet.7b00574
日期:2017.10.9
from 1-Li-2-OTf-o-C2B10H10 undergoes an efficient [4 + 2] cycloaddition with pentafulvenes at room temperature to give a series of carboranonorbornenes in good to high isolated yields. This reaction is compatible with many functional groups and has a very broad substrate scope from 6-mono- to 6,6′-disubstituted pentafulvenes and from alkyl to aryl substituents. Further transformations of the resultant
从1-Li-2-OTf- o -C 2 B 10 H 10原位生成的邻-碳硼烷(1,2-脱氢-邻-甲硼烷)在室温下进行有效的[4 + 2]环戊五烯加成反应,得到一系列高或高分离产率的碳硼烷降冰片烯。该反应与许多官能团相容,并且具有非常宽的底物范围,从6-单-至6,6'-二取代的五氟戊烯和从烷基至芳基取代基。已经对所得的[4 + 2]环加成产物进行了进一步的转化,从而提供了各种多功能的邻氨基甲酸酯。
Diels-Alder reaction of fulvenes with N-(3,5-dichlorophenyl)-maleimide
N-(3,5-Dichlorophenyl)-maleimide reacts smoothly with a variety of substituted fulvenes (1) to give only endo adducts (3) independent of the nature of fulvene substituent, Lewis acid catalyst, and reaction solvent and temperature. The structure of the Diets-Alder adduct 3f was determined by X-ray crystallography. Semi-empirical quantum methods (AM1) were used to rationalize the endo stereoselectivity.