Visible-Light-Driven CarboxyLic Amine Protocol (CLAP) for the Synthesis of 2-Substituted Piperazines under Batch and Flow Conditions
摘要:
Piperazines are privileged scaffolds in medicinal chemistry. Disclosed herein is a visible-light-promoted decarboxylative annulation protocol between a glycine-based diamine and various aldehydes to access 2-aryl, 2-heteroaryl, as well as 2-alkyl piperazines. The iridium-based complex [Ir(ppy)(2)(dtbpy)]PF6 and carbazolyl dicyanobenzene 4CzIPN were found to be the photocatalysts of choice to efficiently perform the transformation under mild conditions, whether in batch or in continuous mode.
Biocatalytic Access to Piperazines from Diamines and Dicarbonyls
作者:Niels Borlinghaus、Sebastian Gergel、Bettina M. Nestl
DOI:10.1021/acscatal.8b00291
日期:2018.4.6
Given the widespread importance of piperazines as building blocks for the production of pharmaceuticals, an efficient and selective synthesis is highly desirable. Here we show the direct synthesis of piperazines from 1,2-dicarbonyl and 1,2-diamine substrates using the R-selective iminereductasefrom Myxococcus stipitatus as biocatalyst. Various N- and C-substituted piperazines with high activity and excellent
Direct α-C–H bondfunctionalization of unprotected cyclic amines Direct α-C–H bondfunctionalization of unprotected cyclic amines, Published online: 06 November 2017; doi:10.1038/nchem.2871NatureArticleSnippet(type=short-summary, markup= Cyclic amines bearing α-substituents are valuable building blocks for drug discovery and natural product synthesis. Introduction of α-substituents via site-selective
L-proline is found to be an efficient catalyst for the Knoevenagel condensation of 2-chloroquinoline-3-
carboxaldehyde 1a-c with an active methylene compound i.e., 2,4-thazolidinedione 2 in IPA affording novel substituted
olefins 3a-c. The latter products reacted with N-substituted-3-phenylpiperazine 4a-c in the presence of KF in DMF to
afford the corresponding 5-[2-(2-phenylpiperazin-1-yl)quinolin]methylene}-2,4-dione derivatives 6a-i. Alternatively, 6ai
were also synthesized from another reaction sequence 1 → 5 → 6. The structures of the synthesized compounds have
been established on the basis of spectral and analytical data.
Substituted (heterocycloalkyl)methyl azole derivatives as c5a receptor modulators
申请人:Zhang Suoming
公开号:US20060154917A1
公开(公告)日:2006-07-13
(Heterocycloalkyl)methyl azole derivatives of Formula (I) are provided: Formula I wherein A is oxygen, sulfur, or NR; J and K and each L are independently oxygen, sulfur, NH, or CH
2
; and the remaining variables are defined herein. Such compounds are modulators of C5a receptors, and preferably bind to C5a receptors with high affinity and exhibit neutral antagonist or inverse agonist activity at C5a receptors. Also provided herein are pharmaceutical compositions comprising such compounds, as well as methods for using such compounds in treating a variety of inflammatory and immune system disorders.
METHOD FOR PRODUCING OPTICALLY ACTIVE 2-ARYLPIPERAZINE DERIVATIVE
申请人:Ohnuki Masatoshi
公开号:US20100087643A1
公开(公告)日:2010-04-08
The objective of the present invention is to produce an optically active 2-arylpiperazine derivative useful as a synthetic intermediate for pharmaceutical products and agricultural chemicals from inexpensive and readily available starting material by an industrially practicable method. The objective can be accomplished by treating an optically active substituted aminodiol derivative produced from an optically active styrene oxide derivative with a sulfonating agent in the presence of a base, and then reacting an amine compound to obtain the 2-arylpiperazine derivative. Especially, an optically active 1-unsubstituted-2-arylpiperazine derivative can be produced by treating an optically active 1-allyl-2-arylpiperazine derivative with water in the presence of a transition metal catalyst for deallylation.