Structurally Defined Molecular Hypervalent Iodine Catalysts for Intermolecular Enantioselective Reactions
作者:Stefan Haubenreisser、Thorsten H. Wöste、Claudio Martínez、Kazuaki Ishihara、Kilian Muñiz
DOI:10.1002/anie.201507180
日期:2016.1.4
Molecular structures of the most prominent chiral non‐racemic hypervalent iodine(III) reagents to date have been elucidated for the first time. The formation of a chirally induced supramolecular scaffold based on a selective hydrogen‐bonding arrangement provides an explanation for the consistently high asymmetric induction with these reagents. As an exploratory example, their scope as chiral catalysts
Enantioselective, Catalytic Vicinal Difluorination of Alkenes
作者:Felix Scheidt、Michael Schäfer、Jérôme C. Sarie、Constantin G. Daniliuc、John J. Molloy、Ryan Gilmour
DOI:10.1002/anie.201810328
日期:2018.12.10
The enantioselective, catalytic vicinal difluorination of alkenes is reported by II/IIII catalysis using a novel, C2‐symmetric resorcinol derivative. Catalyst turnover via in situ generation of an ArIIIIF2 species is enabled by Selectfluor oxidation and addition of an inexpensive HF–amine complex. The HF:amine ratio employed in this process provides a handle for regioselective orthogonality as a function
I / I III催化使用新型C 2对称间苯二酚衍生物进行烯烃的对映选择性催化邻位二氟化反应。通过Selectfluor氧化和添加廉价的HF-胺络合物,可以原位生成ArI III F 2物种进行催化剂转换。此过程中使用的HF:胺比率为布朗选择性酸度的区域选择性正交性提供了一个解决方案。公开了从1,1-二氟化途径(基因)向所需的1,2-二氟化途径(邻位)的选择性逆转(两个方向均> 20:1)。用电子不足的苯乙烯进行验证有助于产生古老的CF 3的手性生物等排体药物发现中普遍使用的单元(20个示例,最高94:06 er)。还使用p- TolI(高达> 95%的收率)显示了反应的非手性变体。
Organoiodine-Catalyzed Enantioselective Intermolecular Oxyamination of Alkenes
作者:Chisato Wata、Takuya Hashimoto
DOI:10.1021/jacs.0c11440
日期:2021.2.3
Metal-free, catalytic enantioselective intermolecular oxyamination of alkenes is realized by use of organoiodine(I/III) chemistry. The protocol is applicable toward aryl- and alkyl-substituted alkenes with high enantioselectivity and electronically controlled regioselectivity. The oxyaminated products can be easily deprotected in one step to reveal free amino alcohols in high yields without loss of
Selective Aryne Formation via Grob Fragmentation from the [2+2] Cycloadducts of 3-Triflyloxyarynes
作者:Jiarong Shi、Hai Xu、Dachuan Qiu、Jia He、Yang Li
DOI:10.1021/jacs.6b12161
日期:2017.1.18
chemoselective ring-opening protocol of the formal [2+2] cycloadducts of 3-triflyloxyarynes was developed to generate 2,3-aryne intermediate via Grob fragmentation. A variety of 1,3-di- and 1,2,3-trisubstituted arenes could be readily accessed through this [2+2] cycloaddition-2,3-aryne formation sequence. The regioselectivity in these transformations originates from the steric repulsion of the aliphatic chain
Enantioselective Synthesis of 3‐Fluorochromanes via Iodine(I)/Iodine(III) Catalysis
作者:Jérôme C. Sarie、Christian Thiehoff、Jessica Neufeld、Constantin G. Daniliuc、Ryan Gilmour
DOI:10.1002/anie.202005181
日期:2020.8.24
bioactive small molecules where it is frequently oxidized at position 3. Motivated by the importance of this position in conferring efficacy, and the prominence of bioisosterism in drug discovery, an iodine(I)/iodine(III) catalysis strategy to access enantioenriched 3‐fluorochromanes is disclosed (up to 7:93 e.r.). In situ generation of ArIF2 enables the direct fluorocyclization of allyl phenyl ethers to generate
苯并二氢吡喃核是生物活性小分子的共有核,在位置 3 上经常被氧化。由于该位置在赋予功效方面的重要性以及生物电子等排性在药物发现中的突出地位,碘 (I)/碘 (III) )公开了获得对映体富集的 3-氟色满的催化策略(高达 7:93 er .)。原位生成 ArIF 2能够直接氟环化烯丙基苯基醚,生成表现出立体电子疏忽效应的新型支架。使用氘代探针进行的机械询问证实了与 II 型inv途径一致的立体特异性过程。