Synthesis and reactivity of enediyne–nucleobase hybrids: effect of intramolecular π-stacking
作者:Snigdha Roy、Subhendu Sekhar Bag、Amit Basak
DOI:10.1016/j.tet.2012.07.093
日期:2012.10
been synthesized to explore the effect of π-stacking interaction in accelerating the rate of Bergmancyclization (BC). Chemical reactivity study, both experimental and computations demonstrated the important role that aromatic π-stacking interactions between the appended nucleobases within an enediyne frame play in lowering the activationbarrier of Bergmancyclization.
Visible light-promoted radical cyclization of silicon-tethered alkyl iodide and phenyl alkyne. An efficient approach to synthesize benzosilolines
作者:Xinglong Lin、Zubao Gan、Ji Lu、Zhishan Su、Changwei Hu、Yuebao Zhang、Ya Wu、Lu Gao、Zhenlei Song
DOI:10.1039/c6cc00635c
日期:——
An efficient approach to synthesize benzosiloline has been developed by a visible light-promoted radical cyclization of silicon-tethered alkyl iodide and phenyl alkyne. The nature of the terminal substituent of alkyne...
Reaction of ene-bis(phosphinylallenes): [2+2] versus [4+2] cycloaddition
作者:Shinji Kitagaki、Yuki Okumura、Chisato Mukai
DOI:10.1016/j.tet.2006.08.083
日期:2006.10
Reaction of ene-bis(phosphinylallenes), derived from ene-bis(propargyl alcohols) and chlorodiphenylphosphine, was investigated. Benzene-bridged bis(phosphinylallenes) exclusively gave intramolecular [2+2] cycloadducts in the presence of dimethyl fumarate in sharp contrast to the reaction of benzene-bridged bis(sulfinylallenes), which gave the corresponding [4+2] cycloadducts. On the other hand, substituted ethylene- or five-membered heterocycle-bridged bis(phosphinylallenes) provided [4+2] cycloadducts. Reaction of benzene-bridged diallene bearing both a sulfinyl group and a phosphinyl group on the two allenyl groups was also described. (c) 2006 Elsevier Ltd. All rights reserved.
Activation of Macrocyclic Enediynes by Transannular Cyclization