Radical C−N Borylation of Aromatic Amines Enabled by a Pyrylium Reagent
作者:Yuanhong Ma、Yue Pang、Sonia Chabbra、Edward J. Reijerse、Alexander Schnegg、Jan Niski、Markus Leutzsch、Josep Cornella
DOI:10.1002/chem.202000412
日期:2020.3.23
Herein, we report a radical borylation of aromatic amines through a homolytic C(sp 2 )-N bond cleavage. This method capitalizes on a simple and mild activation via a pyrylium reagent ( Sc Pyry-OTf) thus priming the amino group for reactivity. The combination of terpyridine and a diboron reagent triggers a radical reaction which cleaves the C(sp 2 )-N bond and forges a new C(sp 2 )-B bond. The unique
Kinetics and mechanisms of nucleophilic displacement with heterocycles as leaving groups. 17. Solvolysis of 14-(primary alkyl)-5,6,8,9-tetrahydro-7-phenyldibenzo[c,h]acridiniums: rates, identification of products, activation parameters, and a general discussion of mechanism
作者:Alan R. Katritzky、Zofia Dega-Szafran、Maria L. Lopez-Rodriguez、Roy W. King
DOI:10.1021/ja00331a030
日期:1984.9
Determination des vitesses de solvolyse des composes du titre pour lesquels alkyl equivaut a methyl, ethyl, propyl, pentyl, octyl, isobutyl, neopentyl, phenethyl et methoxyethyl dans le methanol, l'ethanol, le pentanol, l'acide acetique et son derive trifluore
Determination des vitesses de solvolyse des composes du titre pour lesquels烷基等价物a甲基、乙基、丙基、戊基、辛基、异丁基、新戊基、苯乙基和甲氧基乙基和甲醇、l'乙醇、le戊醇、l'acide acetique等衍生三氟
Transformations of pyridiniums derived from amino-alcohols and from diamines
作者:Alan R. Katritzky、Roland T. Langthorne、Ranjan C. Patel、Gerard Lhommet
DOI:10.1016/s0040-4020(01)88894-3
日期:1981.1
Pyridiniumsderivedfrom amino alcohols cyclise to ethers or rearrange to aldehydes on heating. Monopyridiniums from diamines can be acylated or converted into ureas or thioureas: these products cyclise on heating in solution to give dihydro-thiazoles, -4H-thiazines, -oxazoles, -4H-oxazines, or tetrahydro-3H-thiazepines.
A two-stage conversion of primary-alkyl primary-amines into alcohols and further examples of transfunctionalisation of amines under mild conditions
作者:Alan R. Katritzky、Antonio Saba、Ranjan C. Patel
DOI:10.1039/p19810001492
日期:——
Phase-transfer catalysts allow the conversion of primary-alkylprimary-amines into primary alcohols, sulphones, sulphides, and ethers at ⩽ 100 °C via the pentacyclic pyridiniums (9).
Kinetics and mechanisms of nucleophilic displacements with heterocycles as leaving groups. Part 19. Chemometric investigation of the simultaneous dependence of S N 2 rates on alkyl group structure and leaving group nucleofugacity
作者:Giuseppe Musumarra、Mario Bruno、Alan R. Katritzky、Kumars Sakizadeh、Sergio Alunni、Sergio Clementi
DOI:10.1039/p29850001887
日期:——
kinetics of nucleophilic displacement are reported for four β-branched primary alkyl groups attached to neutral nucleofuges. Principal-component analysis on a set of 10 nucleophilicsubstitution reactions with neutral and anionic nucleofuges finds that the first principal component accounts for 70% of the variance and confirms that the tri- and penta-cyclic nucleofuges are similar to chloride ion in leaving-group