Synthesis of genotoxic heterocyclic amines Trp-P-1 and Trp-P-2
摘要:
Trp-P-1 (1a) and Trp-P-2 (1b) possessing a pyrido[4,3-b]indole system have been newly synthesized. The key reaction step in the synthetic sequence has been the thermal electrocyclic reaction of the 1-azahexa-1,3,5-triene system 3 involving the indole [b] bond derived from 2-vinylindoles 4. 2-Vinylindole 4a has been derived from N-(benzenesulfonyl)indole (5) in a four-step sequence. 2-Vinylindole 4b has been synthesized by two routes using either ethoxymethylidene Meldrum's acid (6b) or diethyl ethoxymethylidenemalonate (10) as Michael acceptors to the 2-lithio-N-(benzenesulfonyl)indole.
NOVEL LOW-MOLECULAR-COMPOUND FOR IMPROVING PRODUCTION, MAINTENANCE AND PROLIFERATION OF PLURIPOTENT STEM CELLS, COMPOSITION COMPRISING THE SAME, AND CULTURE METHOD
申请人:KOREA RESEARCH INSTITUTE OF BIOSCIENCE AND BIOTECHNOLOGY
公开号:US20150159142A1
公开(公告)日:2015-06-11
According to the present invention, when the novel low-molecular-weight compound RSC-133 is added in a culture process for producing reprogrammed pluripotent stem cells from human differentiated cells, it can increase the efficiency of reprogramming and can significantly reduce the time required for the induction of reprogramming. Particularly, the novel compound RSC-133 can substitute for c-Myc acting as both a reprogramming factor and an oncogenic factor, and it can effectively increase the efficiency of reprogramming in both normal oxygen culture conditions and hypoxic culture conditions. In addition, RSC-133 can inhibit the induction of aging occurring in the reprogramming process, exhibits the effect of promoting cell proliferation, and induces epigenetic activation to improve culture conditions for induction of reprogramming. The present invention will contribute to optimizing a process of producing induced pluripotent stem cells from a small amount of patient-specific somatic cells obtained from various sources, and thus it will significantly improve a process of developing clinically applicable personalized stem cell therapy agents and new drugs and will facilitate the practical use of these agents and drugs. In addition, the novel low-molecular-weight compound RSC-133 can provide a cell culture medium effective for maintaining the undifferentiated state of human embryonic stem cells that are typical pluripotent stem cells. The medium composition containing RSC-133 can effectively induce the proliferation of human embryonic stem cells in an undifferentiated state and can be effectively used for the development of a system for culturing large amounts of embryonic stem cells.
Process for producing dipeptides or dipeptide derivatives
申请人:Hashimoto Shin-ichi
公开号:US20050287627A1
公开(公告)日:2005-12-29
The present invention provides a process for producing a dipeptide or a dipeptide derivative using a phosphate donor, a substance selected from the group consisting of adenosine-5′-monophosphate, adenosine-5′-diphosphate and adenosine-5′-triphosphate, one or more kinds of amino acids or amino acid derivatives, and as enzyme sources, a protein having polyphosphate kinase activity, or a culture of cells having the ability to produce the protein or a treated matter of the culture, and a protein having the activity to ATP-dependently form the dipeptide or dipeptide derivative from one or more kinds of amino acids or amino acid derivatives, or a culture of cells having the ability to produce the protein or a treated matter of the culture.
Process For Producing Dipeptides or Dipeptide Derivatives
申请人:Hashimoto Shin-ichi
公开号:US20080213827A1
公开(公告)日:2008-09-04
The present invention provides a process for producing a dipeptide or a dipeptide derivative by using a protein having the activity to form the dipeptide or dipeptide derivative from one or more kinds of amino acids or amino acid derivatives, or a culture of cells having the ability to produce the protein or a treated matter of the culture as a enzyme source, which comprise;
allowing the enzyme source, one or more kinds of amino acids or amino acid derivatives and ATP to be present in an aqueous medium;
allowing the dipeptide or dipeptide derivative to form and accumulate in the medium; and
recovering the dipeptide or dipeptide derivative from the medium.
Aerobic Ru-catalyzed direct C2-olefination of N-heteroarenes with alkenes directed by a removable N-dimethylcarbamoyl group
作者:Luo-Qiang Zhang、Shiping Yang、Xiaolei Huang、Jingsong You、Feijie Song
DOI:10.1039/c3cc44787a
日期:——
A highly efficient and selective Ru-catalyzed direct C2-olefination of indoles, pyrroles, and carbazoles assisted by a removable N-dimethylcarbamoyl group has been developed by using O2 as the terminal oxidant. Both electron-deficient and unactivated alkenes are applicable to the protocol.
Regioselective C2 Oxidative Olefination of Indoles and Pyrroles through Cationic Rhodium(III)-Catalyzed CH Bond Activation
作者:Bin Li、Jianfeng Ma、Weijia Xie、Haibin Song、Shansheng Xu、Baiquan Wang
DOI:10.1002/chem.201301987
日期:2013.9.2
Be economic with your atoms! An efficient Rh‐catalyzedoxidative olefination of indoles and pyrroles with broad substrate scope and tolerance is reported (see scheme). The catalytic reaction proceeds with excellent regio‐ and stereoselectivity. The directing group N,N‐dimethylcarbamoyl was crucial for the reaction and could be removed easily.