One-Step Synthesis of 2- and 4-Nitrobenzyl Cyanides
作者:Asher Kalir、Rivka Mualem
DOI:10.1055/s-1987-27989
日期:——
2-Nitrobenzyl cyanide (2) and analogs were obtained in fair to good yields by reacting the corresponding bromides with sodium cyanide and hydrogen cyanide in dimethyl sulfoxide. Hydrogen cyanide could be generated in situ from an excess of sodium cyanide and trifluoroacetic acid.
Syntheses of two isotopically labeled CB1 receptor antagonists
作者:Boris A. Czeskis
DOI:10.1002/jlcr.2917
日期:2012.5.15
Synthesis of deuterium-labeled CB1 receptor antagonist 2-d9 was accomplished in three steps by alkylation of 2-nitrophenylacetonitrile with cyclopentyl-d9 bromide, reductive cyclization of the resulting secondary nitrile into the 3-cyclopentyl indole-d9 and its N-sulfonylation with corresponding p-amidosulfonyl chloride. Another, structurally related, CB1 receptor antagonist 1 was radiolabeled with carbon-14 by oxidative cleavage of 3-cyclopentyl indole followed by the ring closure of o-acyl substituted N-formylaniline with potassium cyanide-[14C], in situ reduction-elimination of the intermediate amino alcohol, and N-sulfonylation of the resulting 3-cyclopentyl indole-2-[14C].
An efficient and practical synthesis of [2-<sup>11</sup>C]indole via superfast nucleophilic [<sup>11</sup>C]cyanation and RANEY® Nickel catalyzed reductive cyclization
作者:So Jeong Lee、Joanna S. Fowler、David Alexoff、Michael Schueller、Dohyun Kim、Alexander Nauth、Carina Weber、Sung Won Kim、Jacob M. Hooker、Ling Ma、Wenchao Qu
DOI:10.1039/c5ob01654a
日期:——
goal of obtaining of highly reactive 2-(2-nitrophenyl)-[1-11C]acetonitrile ([11C]-2) while inhibiting its rapid conversion to 2,3-bis(2-nitrophenyl)-[1-11C]propanenitrile ([11C]-3). Next, a RANEY® Nickel catalyzed reductive cyclization method was utilized for synthesizing the desired [2-11C]indole with hydrazinium monoformate as the active reducing agent. Extensive and iterative screening of basicity