Regio‐ and Enantioselective Intermolecular Aminofluorination of Alkenes via Iodine(I)/Iodine(III) Catalysis**
作者:Michael Schäfer、Timo Stünkel、Constantin G. Daniliuc、Ryan Gilmour
DOI:10.1002/anie.202205508
日期:2022.8.8
The regio- and enantioselective, intermolecular vicinal fluoroamination of α-trifluoromethyl styrenes was achieved by enantioselective II/IIII catalysis. The transient iodonium intermediate is intercepted with nitriles, which function as both the solvent and nucleophile. In situ Ritter reaction provides direct access to the corresponding amides (up to 89 % yield). Crystallographic analyses of the β-fluoroamide
Stereocontrolled Synthesis of Fluorinated Isochromans via Iodine(I)/Iodine(III) Catalysis
作者:Joel Häfliger、Olga O. Sokolova、Madina Lenz、Constantin G. Daniliuc、Ryan Gilmour
DOI:10.1002/anie.202205277
日期:2022.7.25
A chiral II/IIII catalysis platform is reported to facilitate the fluorocyclization of 2-vinyl benzaldehydes thereby generating novel fluorinated isochromans in a single operation (up to >95 : 05 d.r. and 97 : 03 e.r.). Not only does the benzylic fluoride shield an oxidatively labile position, X-ray analyses demonstrate that the [CH2-CHF] fragment functions as a stereoelectronic mimic of the O-CH(OR)
据报道,手性 I/I III催化平台可促进 2-乙烯基苯甲醛的氟环化,从而在一次操作中生成新型氟化异色满(高达 >95: 05 dr . 和 97: 03 er .)。氟化苄不仅屏蔽了氧化不稳定的位置,X射线分析还表明[CH 2 -CHF]片段起到了O -CH(OR)乙缩醛基序的立体电子模拟物的作用。