Minisci-type investigations on purines were limited to alkylations and arylations. Herein, we present the first method for the direct C–H amidation of a wide range of purines: xanthine, guanine, and adenine structures, including guanosine- and adenosine-type nucleosides. The Minisci-type reaction is also metal-free, cheap, operationally simple, scalable, and applicable to late-stage functionalizations of biologically
Direct decarboxylative Giese amidations: photocatalytic <i>vs.</i> metal- and light-free
作者:David M. Kitcatt、Katie A. Scott、Elena Rongione、Simon Nicolle、Ai-Lan Lee
DOI:10.1039/d3sc03143h
日期:——
developed, which allows for easy access to 1,4-difunctionalised compounds which are not otherwise readilyaccessible. Crucially, a more general acceptor substrate scope is now possible, which renders the Giese amidation applicable to more complex substrates such as natural products and chiralbuildingblocks. Two different photocatalytic methods (one via oxidative and the other via reductive quenching
New oxamic acid compounds and pharmaceutical composition for use in improvement of damaged cerebral functions of brain
申请人:MEIJI SEIKA KAISHA LTD.
公开号:EP0350260A2
公开(公告)日:1990-01-10
New N,N-di-alkyl- or alkenyl-substituted derivatives of oxamic acid of which the two alkyl or alkenyl groups are different from each other are now produced and found to exhibit the cerebral protective effect against cerebral anoxia in brain of a mammalian animal, including human, and to be useful as an agent for improving or ameliorating the damaged or disturbed functions of the brain. Some known N,N-di-alkyl-substituted derivatives of oxamic acid of which the two alkyl groups are identical to each other are now also found to have similar, cerebral protective effect against cerebral anoxia and to be useful as an agent for improving the damaged functions of the brain.