Binding of indolylalkylamines at 5-HT2 serotonin receptors: examination of a hydrophobic binding region
摘要:
Taking advantage of a proposed hydrophobic region on 5-HT2 receptors previously identified by radioligand-binding studies utilizing various phenylisopropylamine derivatives, we prepared and evaluated several N1 - and/or C7-alkyl-substituted derivatives of alpha-methyltryptamine in order to improve its affinity and selectivity. It was determined that substitution of an n-propyl or amyl group has similar effect on affinity regardless of location (i.e., N1 or C7). The low affinity of several N1-alkylpyrroleethylamines suggests that the benzene portion of the alpha-methyltryptamines is necessary for significant affinity. Whereas tryptamine derivatives generally display little selectivity for the various populations of 5-HT receptors, N1-n-propyl-5-methoxy-alpha-methyltryptamine (3h) binds with significant affinity (Ki = 12 nM) and selectivity at 5-HT2 receptors relative to 5-HT1A (Ki = 7100 nM), 5-HT1B (Ki = 5000 nM), 5-HT1C (Ki = 120 nM), and 5-HT1D (Ki greater than 10,000 nM) receptors. As a consequence, this is the most 5-HT2-selective indolylalkylamine derivative reported to date.
Divergent Dehydrogenative Coupling of Indolines with Alcohols
作者:Xue Jiang、Weijun Tang、Dong Xue、Jianliang Xiao、Chao Wang
DOI:10.1021/acscatal.6b03667
日期:2017.3.3
The dehydrogenativecoupling of indolines with alcohols catalyzed by an iridium complex has been achieved to afford both N- and C3-alkylated indoles selectively, by simply changing the addition time of a base additive. The iridacycle catalyst plays multiple roles in these reactions, which dehydrogenates both amines and alcohols and catalyzes the coupling reactions. Mechanistic studies reveal that a
Iridium- and Rhodium-Catalyzed Directed C–H Heteroarylation of Benzaldehydes with Benziodoxolone Hypervalent Iodine Reagents
作者:Erwann Grenet、Jérôme Waser
DOI:10.1021/acs.orglett.8b00337
日期:2018.3.2
The C–H heteroarylation of benzaldehydes with indoles and pyrroles was realized using the benziodoxolone hypervalent iodine reagents indole- and pyrroleBX. Functionalization of the aldehyde C–H bond using either an o-hydroxy or amino directing group and catalyzed by an iridium or a rhodium complex allowed the synthesis of salicyloylindoles and (2-sulfonamino)benzoylindoles, respectively, with good
A Gold- and<i>Brønsted</i>Acid Catalytic Interplay Towards the Synthesis of Highly Substituted Tetrahydrocarbazoles
作者:David Garayalde、Giulia Rusconi、Cristina Nevado
DOI:10.1002/hlca.201600333
日期:2017.3
and stabilized cyclopropyl alkynes under gold‐ and/or gold & Brønsted acid‐catalysis provided access to highlysubstitutedtetrahydrocarbazoles. A mechanistic study revealed the complex mechanism underlying these processes and the opportunistic cooperation of Lewis and Brønsted acid‐catalysts towards the formation of complex molecular scaffolds.
Friedel–Crafts Fluoroacetylation of Indoles with Fluorinated Acetic Acids for the Synthesis of Fluoromethyl Indol-3-yl Ketones under Catalyst- and Additive-Free Conditions
indoles is reported. The reaction uses fluorinated acetic acids as the fluoroacetylation reagents to synthesize diverse fluoromethyl indol-3-yl ketones in good yields under catalyst- and additive-free conditions. In addition, the only byproduct is water in this transformation. The synthetic utility of this reaction was also demonstrated by the concise synthesis of α-(trifluoromethyl)(indol-3-yl)methanol