Ham J, Cho SJ, Ko J, Chin J, Kang H. A Facile One-Pot Preparation of Alkyl Aminoaryl Sulfides for the Synthesis of GW7647 as an Agonist of Peroxisome Proliferator-Activated Receptor α.
J Org Chem 2006;
71:5781-4. [PMID:
16839165 DOI:
10.1021/jo060361i]
[Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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.
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