作者:Denise Andersen、Thomas Storz、Pingli Liu、Xin Wang、Leping Li、Pingchen Fan、Xiaoqi Chen、Alan Allgeier、Alain Burgos、Jason Tedrow、Jean Baum、Ying Chen、Rich Crockett、Liang Huang、Rashid Syed、Robert D. Larsen、Mike Martinelli
DOI:10.1021/jo701894v
日期:2007.12.1
[GRAPHICS]Melanin-concentrating hormone (MCH) is implicated in the feeding behavior in mammals affording a potential target to control overeating in people. Compound 1 (AMG 076) has been identified as a potent MCHr1 antagonist for the treatment of obesity. A synthesis suitable for the large-scale preparation of this lead candidate was developed to support preclinical studies. A Robinson annulation of benzylpiperidone and resolution of the desired enone from a mixture of the diastereomers afforded key intermediate 6 after a stereoselective hydrogenation. Subsequent Fischer indole synthesis with hydrazine 5 then provided the advanced intermediate, indole 2. Two complementary reductive amination strategies employing either aldehyde 3 or lactol 4 led to the synthesis of title compound 1.