Journal of Organic Chemistry 2006-07-21

A facile one-pot preparation of alkyl aminoaryl sulfides for the synthesis of GW7647 as an agonist of peroxisome proliferator-activated receptor alpha.

Jungyeob Ham, Sung Jin Cho, Jaeyoung Ko, Jungwook Chin, Heonjoong Kang

Index: J. Org. Chem. 71 , 5781, (2006)

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Abstract

We have developed two simple and high yielding one-pot syntheses of alkyl aminoaryl sulfides containing a series of four-steps: in situ protection of the free amine by reaction with a Grignard reagent, halogen-lithium exchange, sulfur insertion, and a substitution reaction with various electrophiles. Through this protocol, we have successfully synthesized tert-butyl-2-[4-(2-aminoethyl)phenylsulfanyl]-2-methylpropanoate, a key intermediate for the synthesis of GW7647 and GW9578 (ureido-TiBAs), in 92% yield. Furthermore, we were able to improve the overall yield of GW7647 to 66%, 3 times the yield previously reported.