Stereoselective synthesis of iodofluoroalkenes by iodofluorination of alkynes using IF5-pyridine-HF
作者:Hitoshi Ukigai、Shoji Hara
DOI:10.1016/j.tetlet.2016.02.063
日期:2016.3
The iodofluorination of alkynes was carried out using IF5-pyridine-HF and hydroquinone. The iodofluorination of an internal alkyne and a terminal alkyne proceeded stereoselectively to give the corresponding iodofluoroalkenes. An unsymmetrically substituted internal alkyne and electron deficient alkyne also afforded the corresponding iodofluoroalkenes stereoselectively. The iodofluoroalkenes thus obtained
Tetris in monolayers: patterned self-assembly using side chain shape
作者:Yi Xue、Matthew B. Zimmt
DOI:10.1039/c1cc12498f
日期:——
The “kinked” shapes of conjugated alkadiynes constrain chain packing in monolayers on HOPG. Centrally located diyne units permit assembly of 1,5-bis(alkadiyne)anthracene monolayers. Off-center diynes inhibit self-assembly. Shape matched pairs of off-center diyne chains direct self-assembly of compositionally patterned, two component monolayers.
Efficient synthesis of 1-iodoalkynes <i>via</i> Al<sub>2</sub>O<sub>3</sub> mediated reaction of terminal alkynes and <i>N</i>-iodosuccinimide
作者:Ming Yao、Jingjing Zhang、Sen Yang、Hangxing Xiong、Li Li、E. Liu、Hong Shi
DOI:10.1039/d0ra00251h
日期:——
Iodination of terminalalkynes using N-iodosuccinimide (NIS) in the presence of γ-Al2O3 was developed to afford 1-iodoalkynes with good to excellent yields (up to 99%). This described approach featured excellent chemoselectivity, good functional group tolerance, and utilization of an inexpensive catalyst.
开发了在 γ-Al 2 O 3存在下使用N-碘代琥珀酰亚胺 (NIS) 对末端炔进行碘化,以提供良好至优异产率(高达 99%)的 1-碘炔。这种方法具有优异的化学选择性、良好的官能团耐受性以及使用廉价催化剂的特点。
Acetic Acid Promoted Direct Iodination of Terminal Alkynes with N-Iodosuccinimide: Efficient Preparation of 1-Iodoalkynes
作者:Ming Yao、Hangxing Xiong、Jingjing Zhang、Sen Yang、E Liu
DOI:10.1055/s-0040-1708002
日期:2020.7
An efficient and highly chemoselective approach for the direct iodination of terminal alkynes using acetic acid as N-iodosuccinimide activated reagent under metal-free conditions has been developed. This facile process tolerates a variety of terminal alkynes and provides the desired products in good to excellent yields (up to 99%).
A copper-catalyzed reaction of terminal alkynes with cyanogen iodide (ICN) that produces alkynyl cyanides has been developed. The use of tetramethylpiperidine as a sterically congested base was successful in this reaction. Some control experiments revealed that the reaction involves the noncatalyzed formation of alkynyl iodides followed by copper-catalyzed cyanation of the iodides without the formation