Discovery of 2-(2-Chlorophenyl)-3-(4-chlorophenyl)-7-(2,2-difluoropropyl)-6,7-dihydro-2H-pyrazolo[3,4-f][1,4]oxazepin-8(5H)-one (PF-514273), a Novel, Bicyclic Lactam-Based Cannabinoid-1 Receptor Antagonist for the Treatment of Obesity
摘要:
We report the design, synthesis, and structure-activity relationships of novel bicyclic lactam-based cannabinoid type 1 (CB,) receptor antagonists. Members of these series are potent, selective antagonists in in vitro/in vivo efficacy models of CB, antagonism and exhibit robust oral activity in rodent models of food intake. These efforts led to the identification of 19d, which has been advanced to human clinical trials for weight management.
Discovery of 2-(2-Chlorophenyl)-3-(4-chlorophenyl)-7-(2,2-difluoropropyl)-6,7-dihydro-2H-pyrazolo[3,4-f][1,4]oxazepin-8(5H)-one (PF-514273), a Novel, Bicyclic Lactam-Based Cannabinoid-1 Receptor Antagonist for the Treatment of Obesity
摘要:
We report the design, synthesis, and structure-activity relationships of novel bicyclic lactam-based cannabinoid type 1 (CB,) receptor antagonists. Members of these series are potent, selective antagonists in in vitro/in vivo efficacy models of CB, antagonism and exhibit robust oral activity in rodent models of food intake. These efforts led to the identification of 19d, which has been advanced to human clinical trials for weight management.
<i>gem</i>-Difluorination of Aminoalkynes via Highly Reactive Dicationic Species in Superacid HF−SbF<sub>5</sub>: Application to the Efficient Synthesis of Difluorinated Cinchona Alkaloid Derivatives
reacted in the superacid system HF−SbF5 to give regioselectively new β-gem-difluoroamines. The reaction, which is not observed in pure HF, is consistent with the formation of a dicationic intermediate (i.e., both vinylic and adjacent protonated N-ammonium cations). Application to the regioselective and efficient synthesis of difluorinated cinchona alkaloid derivatives is described.
Selective Synthesis of <i>gem</i>-Chlorofluorinated Nitrogen-Containing Derivatives after Superelectrophilic Activation in Superacid HF/SbF<sub>5</sub>
The first direct selective synthesis of novel gem-chloro-fluorinated nitrogen-containing building blocks in super-acid is reported. The dramatic role of the chlorine atom on the reaction is shown by in situ NMR experiments and allows the involvement of a novel original superelectrophilic activation process in superacid HF/SbF5 to be postulated.