Organocatalyzed, Visible-Light Photoredox-Mediated, One-Pot Minisci Reaction Using Carboxylic Acids via <i>N</i>-(Acyloxy)phthalimides
作者:Trevor C. Sherwood、Ning Li、Aliza N. Yazdani、T. G. Murali Dhar
DOI:10.1021/acs.joc.8b00205
日期:2018.3.2
one-pot Minisci reaction has been developed using visible light, an organic photocatalyst, and carboxylic acids as radical precursors via the intermediacy of in situ-generated N-(acyloxy)phthalimides. The conditions employed are mild, demonstrate a high degree of functional group tolerance, and do not require a large excess of the carboxylic acid reactant. As a result, this reaction can be applied to
The present invention provides a cyclic aminomethyl pyrimidine derivative and a pharmaceutically acceptable salt thereof with high selectivity for dopamine D
4
receptors, which are useful for treating a disease such as attention deficit hyperactivity disorder. Specifically, a compound of formula (1) or a pharmaceutically acceptable salt thereof is provided, wherein n and m are independently 1 or 2; R
a
is C
1-6
alkyl group, C
3-6
cycloalkyl group, or amino group; R
b
is hydrogen atom, C
1-6
alkyl group or the like, provided that when R
a
is amino group, then R
b
is hydrogen atom; R
c1
and R
c2
are independently hydrogen atom, or C
1-6
alkyl group; R
d1
and R
d2
are independently hydrogen atom, fluorine atom or the like; ring Q is an optionally-substituted pyridyl group or an optionally-substituted isoquinolyl group; and the bond having a dashed line is a single or double bond.
Metal-Free Oxidative Decarbonylative Coupling of Aliphatic Aldehydes with Azaarenes: Successful Minisci-Type Alkylation of Various Heterocycles
作者:Ren-Jin Tang、Lei Kang、Luo Yang
DOI:10.1002/adsc.201500268
日期:2015.6.15
A metal‐free oxidative decarbonylative coupling of aliphaticaldehydes with various electron‐deficient heterocycles has been developed. This reaction is supposed to be realized via a Minisci‐type mechanism, based on the substrate scope, regioselectivity and radical trapping experiments. The ready availability of aliphaticaldehydes, metal‐free conditions and broad substrate scope should make this method
Benzoyl Peroxide Promoted Radical<i>ortho</i>-Alkylation of Nitrogen Heteroaromatics with Simple Alkanes and Alcohols
作者:Lei Fang、Liangshun Chen、Jianjun Yu、Limin Wang
DOI:10.1002/ejoc.201403479
日期:2015.3
A catalytic amount of benzoylperoxide (BPO)-initiated cross-dehydrogenative coupling reaction of N-iminopyridine ylides with simplealkanes and alcohols leads to the corresponding 2-alkylpyridines with high regioselectivity in moderate to good yields without an additional reduction step to remove the activated group.
Purple Light-Promoted Coupling of Bromopyridines with Grignard Reagents via SET
作者:Xingyu Lei、Yihan Wang、Shanshan Ma、Peng Jiao
DOI:10.1021/acs.joc.4c00525
日期:2024.5.17
cycloalkyl, aryl, heteroaryl, pyridyl, and alkynyl Grignardreagents were compatible with the protocol. As a result, alkyl- and arylpyridines and 2,2′-bipyridines were easily prepared. Single electron transfer from the Grignardreagent to bromopyridine was stimulated by purple light. An electron extruded from the dimerization of the Grignardreagent worked as the catalyst. Light on/off experiments indicated
烷基吡啶和芳基吡啶以及2,2'-联吡啶通常通过吡啶的Minisci反应和卤代吡啶的过渡金属催化的偶联反应来制备。在此,首次公开了在普通玻璃器皿中的Et 2 O或Et 2 O与四氢呋喃的混合物中,紫光促进的2-或4-溴吡啶与格氏试剂的自由基偶联反应,而不需要过渡金属催化剂。甲基、伯烷基和仲烷基、环烷基、芳基、杂芳基、吡啶基和炔基格氏试剂与该方案兼容。结果,很容易制备烷基吡啶和芳基吡啶以及2,2'-联吡啶。紫光刺激从格氏试剂到溴吡啶的单电子转移。格氏试剂二聚过程中挤出的电子充当催化剂。光开/关实验表明产物的形成需要持续的照射。自由基时钟底物的研究证实了来自溴吡啶的吡啶基自由基的参与以及来自格氏试剂的烷基或芳基自由基的不参与。现有证据支持新偶联反应的光诱导 S RN机制。