Small molecules which can modulate endogenous microRNAs are important chemical tools to study microRNA regulational network. In this Letter we screened the [2+2] photocycloadducts of 2-methoxy-1,4-naphthalenequinone with a series of aryl acetylenes on their activity to modulate endogenous microRNAs. A potent inhibitor of the muscle-specific miR-1 which is closely related with cardiac development and disease was identified. The small molecular inhibitor was the cyclobutene type product derived from the photocycloaddition of 2-methoxy-1,4-naphthalenequinone with tert-butyl (5-(phenylethynyl) quinolin-8-yl) carbonate. Analogues of the small molecular inhibitor were then prepared using similar photocycloaddition reactions for evaluation on inhibition activity on miR-1 to provide structure-activity relationship of the miR-1 inhibitor. (C) 2013 Elsevier Ltd. All rights reserved.
One-Pot Procedure for the Synthesis of<i>N</i>-Substituted 2-(Arylmethyl)pyrrolidines from 1-Aryl-2-cyclopropylalkynes and Primary Amines by a Hydroamination/Cyclopropylimine Rearrangement/Reduction Sequence
作者:Kerstin Gräbe、Björn Zwafelink、Sven Doye
DOI:10.1002/ejoc.200900515
日期:2009.11
A one-pot procedure for the synthesis of N-substituted 2-(arylmethyl)pyrrolidines from 1-aryl-2-cyclopropylalkynes and primary amines is presented. The procedure proceeded first through an [Ind2TiMe2]-catalyzed regioselective hydroamination of a 1-aryl-2-cyclopropylalkyne with a primary amine. The resulting cyclopropylimine, which was not isolated, was then forced to undergo a cyclopropylimine rearrangement
synthesized with high diversity in three steps from arylhalides, terminal alkynes, and primary amines. The reaction sequence starts with a palladium-catalyzed coupling of an arylhalide and a terminal alkyne (Sonogashira coupling). A subsequent Cp2TiMe2-catalyzed hydroamination of the obtained alkyl(aryl)alkyne, which takes place regioselectively in the 2-position, gives access to an α-arylketimine