218449-30-0Relevant articles and documents
Facile Access to 1,4-Disubstituted Pyrrolo[1,2- a ]pyrazines from α-Aminoacetonitriles
Basha, Mushkin,Belema, Makonen,Dhar, T. G. Murali,Gupta, Anuradha,Gupta, Arun Kumar,Indasi, Gopi Kumar,Karmakar, Ananta,Mathur, Arvind,Meanwell, Nicholas A.,Ramalingam, Sridharan,Rampulla, Richard
supporting information, p. 441 - 449 (2020/01/23)
An efficient and practical synthetic protocol for the synthesis of 1,4-disubstituted pyrrolo[1,2- a ]pyrazine derivatives is described that originates from α-substituted pyrroloacetonitriles which, in turn, are readily available from aryl and alkyl aldehydes. The α-pyrroloacetonitriles were subjected to a Friedel-Crafts acylation with methyl chlorooxoacetate followed by reduction of the nitrile group under Pd-catalyzed hydrogenation conditions and finally aromatization with DDQ leading to the desired pyrrolo[1,2- a ]pyrazine derivatives. This method was generalized and successfully applied to various aryl, heteroaryl, and alkyl substrates. The developed protocol provides direct and convenient access to 1,4-disubstituted ring systems in moderate to good overall yields (51-68percent) without the need for purification of the intermediates. Further functionalization via the stepwise halogenation (bromination, iodination) and nitration was also demonstrated. In addition, the potential of the ester functionality for elaboration was demonstrated by manipulating into heterocyclic ring systems, exemplified by conversion into benzoxazole derivatives.
Discovery of novel spiro-piperidine derivatives as highly potent and selective melanin-concentrating hormone 1 receptor antagonists
Suzuki, Takao,Moriya, Minoru,Sakamoto, Toshihiro,Suga, Takuya,Kishino, Hiroyuki,Takahashi, Hidekazu,Ishikawa, Makoto,Nagai, Keita,Imai, Yumiko,Sekino, Etsuko,Ito, Masahiko,Iwaasa, Hisashi,Ishihara, Akane,Tokita, Shigeru,Kanatani, Akio,Sato, Nagaaki,Fukami, Takehiro
scheme or table, p. 3072 - 3077 (2010/02/28)
Optimization of high-throughput screening hit 1a led to the identification of a novel spiro-piperidine class of melanin-concentrating hormone 1 receptor (MCH-1R) antagonists. Compound 3c was identified as a highly potent and selective MCH-1R antagonist, which has an IC50 value of 0.09 nM at hMCH-1R. The synthesis and structure-activity relationships of the novel spiro-piperidine MCH-1R antagonists are described.
Development of a new α-aminonitrile synthesis
Chu, Guo-Hua,Gu, Minghua,Gerard, Baudouin,Dolle, Roland E.
, p. 4583 - 4590 (2007/10/03)
α-Aminonitriles are prepared upon reaction of aryl carboxaldehydes with LiHMDS and acetone cyanohydrin. This new method provides a general route to the synthesis of various substituted α-aminoarylacetonitriles in high yield and purity, and avoids the use of the highly toxic cyanide salts.
