Chemoselective Intramolecular Functionalization of Methyl Groups in Nonconstrained Molecules Promoted by N-Iodosulfonamides
摘要:
Mechanistic evidence observed in Hofmann-Loffler-Freytag-type reactions has been crucial to achieve the chemoselective functionalization of methyl groups under mild conditions. Radical-mediated methyl iodination and subsequent oxidative deiodination are the key steps in this functionalization, where iodine chemistry has a pivotal role on the formation of the C-N bond. The concepts of single hydrogen atom transfer (SHAT) and multiple hydrogen atom transfer (MHAT) are introduced to describe the observed chemoselectivity.
Catalytic C(sp
<sup>3</sup>
)−H Arylation of Free Primary Amines with an
<i>exo</i>
Directing Group Generated In Situ
作者:Yan Xu、Michael C. Young、Chengpeng Wang、David M. Magness、Guangbin Dong
DOI:10.1002/anie.201604268
日期:2016.7.25
Herein, we report the palladium‐catalyzeddirectarylation of unactivated aliphatic C−H bonds in free primary amines. This method takes advantage of an exo‐imine‐type directing group (DG) that can be generated and removed in situ. A range of unprotected aliphatic amines are suitable substrates, undergoing site‐selective arylation at the γ‐position. Methyl as well as cyclic and acyclic methylene groups
Rapid and Quantitative Profiling of Substrate Specificity of ω‐Transaminases for Ketones
作者:Sang‐Woo Han、Jong‐Shik Shin
DOI:10.1002/cctc.201900399
日期:2019.7.18
capability for asymmetric synthesis of chiral amines from ketones. Reliable high‐throughput activity assay of ω‐TAs is essential in carrying out extensive substrate profiling and establishing a robust screening platform. Here we report spectrophotometric and colorimetric methods enabling rapid quantitation of ω‐TA activities toward ketones in a 96‐well microplate format. The assay methods employ benzylamine
1-(Alkyl/Arylthiocarbamoyl)benzotriazoles as Stable Isothiocyanate Equivalents: Synthesis of Di- and Trisubstituted Thioureas
作者:Alan R. Katritzky、Stephane Ledoux、Rachel M. Witek、Satheesh K. Nair
DOI:10.1021/jo035680d
日期:2004.4.1
1-(Alkyl/arylthiocarbamoyl)benzotriazoles 4a−i were synthesized in yields of 91−99% from bis(benzotriazolyl)methanethione (3). Reagents 4a−g were then used as isothiocyanate equivalents for the efficient synthesis of 10 secondary and 14 tertiary thioureas in high-yielding, convenient processes.
作者:Jean Bowler、Timothy J. Lilley、John D. Pittam、Alan E. Wakeling
DOI:10.1016/0039-128x(89)90076-7
日期:1989.7
A series of steroidal estrogen antagonists with no intrinsic estrogenicity in rat uterotrophic-antiuterotrophic tests has been discovered. The compounds are derivatives of estradiol containing amidoalkyl side chains at the 7 alpha-position. The most potent compounds are N-n-butyl-N-methyl-11-(3,17 beta-dihydroxyestra- 1,3,5(10)-trien-7 alpha-yl) undecanamide and N-2,2,3,3,4,4,4-heptafluorobutyl-N-methyl-11-(3
Syntheses and Neuraminidase Inhibitory Activity of Multisubstituted Cyclopentane Amide Derivatives
作者:Pooran Chand、Y. Sudhakar Babu、Shanta Bantia、Scott Rowland、Ali Dehghani、Pravin L. Kotian、Tracy L. Hutchison、Shoukath Ali、Wayne Brouillette、Yahya El-Kattan、Tsu-Hsing Lin
DOI:10.1021/jm0303406
日期:2004.4.1
position 3, were tested for their ability to inhibit A and B forms of influenza neuraminidase. The 1-ethylpropylamide, diethylamide, dipropylamide, and 4-morpholinylamide showed very good inhibitoryactivity (IC(50) = 0.015-0.080 microM) vs the neuraminidase A form, but modest activity (IC(50) = 3.0-9.2 microM) vs the neuraminidase B form. Since the parent amides bear two chiral centers (C-1 and C-1'), three