Regio- and Enantioselective Aminofluorination of Alkenes
作者:Wangqing Kong、Pascal Feige、Teresa de Haro、Cristina Nevado
DOI:10.1002/anie.201208471
日期:2013.2.25
Enantio‐ and regioselective: The intramolecular enantioselective aminofluorination of unactivated olefins was achieved by using a chiral iodo(III) difluoride salt. A highly regioselective aminofluorination of styrenes to access 2‐fluoro‐2‐phenylethanamines was also developed.
FeBr3-catalyzed regioselective intramolecular sulfenoamination of unactivated terminal olefins
作者:Lin-Chuang Zheng、Lin Li、Lili Duan、Yue-Ming Li
DOI:10.1016/j.tet.2019.130619
日期:2019.11
A method for regioselective intramolecular sulfenoamination of unactivated terminal olefins was reported. Using sulfonyl hydrazides as the sulfur sources, FeBr3 as the catalyst and (NH4)2S2O8 as the oxidant, different sulfenylmethylpyrrolidines and sulfenylmethylpiperidines were obtained in moderate to high yields via intramolecular sulfenoamination of (sulfon)amidopentenes or (sulfon)amidohexenes
报道了未活化的末端烯烃的区域选择性分子内磺酰胺化的方法。以磺酰肼为硫源,以FeBr 3为催化剂,以(NH 4)2 S 2 O 8为氧化剂,通过(磺)酰胺基戊二烯或(磺)的分子内磺酰胺化反应,以中等至高收率获得了不同的亚磺酰基甲基吡咯烷和亚磺酰基甲基哌啶。氨基己烯。
Regioselective Copper(II)-Mediated Bromoamination of Unfunctionalized Olefins: An Efficient Route to N-Heterocyclic Compounds
作者:Gong-Qing Liu、Zhen-Ying Ding、Li Zhang、Ting-Ting Li、Lin Li、Lili Duan、Yue-Ming Li
DOI:10.1002/adsc.201301125
日期:2014.7.7
Bromoamination of unfunctionalized olefins was realized under mild conditions using copper(II) bromide (CuBr2) as both reaction promoter and bromine source. The reactions could be carried out under open air at ambient temperature, and both N‐alkylated and N‐tosylated substrates could be converted to the corresponding N‐heterocyclic compounds in high regioselectivity and good isolated yields. A variety
An intramolecular selenocyclizations of olefins mediated by a commercially available hypervalent iodine(III) reagent, PhIO, was developed. This method provided access to a wide range of selenenylated heterocycles under ambient conditions. The striking advantages of this protocol over all previous methods include mild reaction conditions, easy operation, good yields, high levels of functional group
A time-economical and robust synthesis of various selenofunctionalized heterocycles was accomplished via I2O5-mediated selenocyclizations of olefins with diselenides. Using this method, 116 selenomethyl-substituted heterocycles were synthesized with up to 97% isolated yield in minutes. Additional features of this new protocol include the use of an inorganic oxidant, mild conditions, and easy operation
通过I 2 O 5介导的烯烃与二硒化物的硒环化,实现了各种硒官能化杂环的经济且稳健的合成。使用这种方法,在几分钟内合成了 116 个硒甲基取代的杂环,分离产率高达 97%。这个新协议的其他特点包括使用无机氧化剂、温和的条件和易于操作。初步研究表明,这种转化是通过硒基碘诱导的亲电环化进行的。