Exploiting Iminoquinones as Electrophilic at Nitrogen “N+” Synthons for C–N Bond Construction
作者:Luis M. Mori-Quiroz、Chelsea G. Comadoll、Jonathan E. Super、Michael D. Clift
DOI:10.1021/acs.orglett.1c00867
日期:2021.9.17
New methods for C–N bond construction exploiting the N-centered electrophilic character of iminoquinones are reported. Iminoquinones, generated in situ via the condensation of o-vinylanilines with benzoquinones, undergo acid-catalyzed cyclization to afford N-arylindoles in excellent yields. Under similar reaction conditions, homoallylic amines react analogously to afford N-arylpyrroles. Additionally
报道了利用亚氨基醌的 N 中心亲电特性构建 C-N 键的新方法。通过邻乙烯基苯胺与苯醌缩合原位生成的亚氨基醌经过酸催化环化以优异的产率得到N-芳基吲哚。在类似的反应条件下,高烯丙基胺类似地反应得到N-芳基吡咯。此外,有机金属亲核试剂显示出添加到N-烷基亚氨基醌的氮原子上以提供胺产物。最后,亚氨基醌被证明是铜催化加氢胺化反应的亲电试剂。
Synthesis of Enantiopure Benzyl Homoallylamines by Indium-Mediated Barbier-Type Allylation Combined with Enzymatic Kinetic Resolution: Towards the Chemoenzymatic Synthesis of N-Containing Heterocycles
作者:Ari Hietanen、Tiina Saloranta、Sara Rosenberg、Evelina Laitinen、Reko Leino、Liisa T. Kanerva
DOI:10.1002/ejoc.200901216
日期:2010.2
N-(dimethylsulfamoyl)-protected aldimines with a number of allyl bromides followed by high-yielding deprotection afforded allylic amines in good to excellent yields. The racemic amines were then subjected to enzymatic kinetic resolution in order to obtain the corresponding (S)-amines and (R)-amides. When acyl donors with a terminal double bond were applied in the enzymatic kinetic resolution, the product amide
Formal α-Allylation of Primary Amines by a Dearomative, Palladium-Catalyzed Umpolung Allylation of <i>N</i>-(Aryloxy)imines
作者:Luis M. Mori-Quiroz、Shrikant S. Londhe、Michael D. Clift
DOI:10.1021/acs.joc.0c01020
日期:2020.12.4
N-(Aryloxy)imines, readily accessible by condensation/tautomerization of (pseudo)benzylic primaryamines and 2,6-di-tert-butyl-1,4-benzoquinone, undergo efficient allylation to afford a wide range of homoallylic primaryamines following hydrolytic workup. Deprotonation of N-(aryloxy)imines generates a delocalized 2-azaallyl anion-type nucleophile that engages in dearomative C–C bond-forming reactions
An enantioselectivesynthesis of α-fluoroaryl homoallylic amines in 52–71% yields and 76–93% enantioselectivities has been achieved via the allylboration of the corresponding fluorinated N-aluminobenzaldimines with B-allyldiisopinocampheylborane in the presence of methanol, followed by alkaline hydrogen peroxide workup. Crotylboration of these aluminobenzaldimines with potassium B-methoxy B-E- or
Rhodium-Catalyzed Regiodivergent Hydrothiolation of Allyl Amines and Imines
作者:Jennifer L. Kennemur、Gregory D. Kortman、Kami L. Hull
DOI:10.1021/jacs.6b07142
日期:2016.9.14
The regiodivergent Rh-catalyzed hydrothiolation of allyl amines and imines is presented. Bidentate phosphine ligands with larger natural bite angles (βn ≥ 99°), for example, DPEphos, dpph, or L1, promote a Markovnikov-selective hydrothiolation in up to 88% yield and >20:1 regioselectivity. Conversely, when smaller bite angle ligands (βn ≤ 86°), for example, dppbz or dppp, are employed, the anti-Markovnikov