Hetarynic synthesis and chemical transformation of dihydrodipyridopyrazines
摘要:
Unprecedented dihydrodipyridopyrazines were easily obtained by hetarynic dimerization of 2-alkylamino-3-halogenopyridines in the presence of the complex base NaNH2-tBuONa. Derivatizations of the new heterocycles are described. The anticancer activity of these compounds is also mentioned. (C) 2002 Elsevier Science Ltd. All rights reserved.
Ir-catalyzed enantioselective addition of an N-methyl C–H bond of 2-(methylamino)pyridine derivatives to α-trifluoromethylstyrenes proceeded via C–Hactivation to give chiral γ-branched amine derivatives having a trifluoromethyl-substituted stereocenter. It was found that a bulky and electron-withdrawing group at the 3-position of 2-(methylamino)pyridines was necessary for the present C–H addition reaction
Iridium- and Rhodium-Catalyzed Dehydrogenative Silylations of C(sp<sup>3</sup>)H Bonds Adjacent to a Nitrogen Atom Using Hydrosilanes
作者:Tsuyoshi Mita、Kenichi Michigami、Yoshihiro Sato
DOI:10.1002/asia.201300930
日期:2013.12
silylated: In the presence of iridium or rhodium catalysts, C(sp3)H bonds adjacent to a nitrogen atom were silylated by the aid of a pyridine‐directing group. In iridium catalysis, a hydrogen‐trapping reagent such as norbornene or tert‐butylethylene, which is usually required in late transition‐metal‐catalyzeddehydrogenative coupling reactions, was not required. In rhodium catalysis, however, 1 equivalent
C–H alkylation of an N-methyl group with 1,5- and 1,6-dienes proceeded to give five- and six-membered carbocyclic compounds, respectively, in high yields. The reaction involves intermolecular alkylation of the N-methyl group with a vinyl moiety and subsequent intramolecular cyclization at the β-position of the initially formed alkylated intermediate. The reaction using a chiral bidentate phosphine ligand
NOVEL CANNABINOID RECEPTOR LIGANDS, PHARMACEUTICAL COMPOSITIONS CONTAINING THEM, AND PROCESS FOR THEIR PREPARATION
申请人:MUTHUPPALANIAPPAN Meyyappan
公开号:US20120142748A1
公开(公告)日:2012-06-07
The present invention relates to novel cannabinoid receptor modulators, in particular cannabinoid 1 (CB1) or cannabinoid 2 (CB2) receptor modulators, and uses thereof for treating diseases, conditions and/or disorders modulated by a cannabinoid receptor.
Asymmetric addition of an <i>N</i>-methyl C(sp<sup>3</sup>)–H bond to cyclic alkenes enabled by an iridium/phosphine–olefin catalyst
作者:Kana Sakamoto、Takahiro Nishimura
DOI:10.1039/d2cc04642c
日期:——
asymmetric C–H addition of an N-methyl group on 3-trifluoromethyl-2-(N-methylamino)pyridine to cyclic alkenes was realized by using a phosphine–olefin ligand. Indene and its 7-substitutedderivatives, acenaphthylene, and some bicyclic alkenes underwent the addition to give the corresponding products in good yields with high enantioselectivity.