Song F, Chen L, Lin R, Salter R. Synthesis of carboxy-polyethylene glycol-amine (CA (PEG)
n ) and [1-
14 C]-CA (PEG)
n via oxa-Michael addition of amino-polyethylene glycols to propiolates vs to acrylates.
J Labelled Comp Radiopharm 2020;
63:15-24. [PMID:
31736118 DOI:
10.1002/jlcr.3816]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 10/18/2019] [Accepted: 11/03/2019] [Indexed: 11/06/2022]
Abstract
Synthesis of carboxy-polyethylene glycol-amine (CA (PEG)n ) via oxa-Michael addition of amino-polyethylene glycols to either acrylates or propiolates was investigated. Compared with the oxa-Michael addition to acrylates, the corresponding addition to propiolates was found to proceed under mild reaction conditions and afford the adducts in high yields from a broad scope of substrates. A two-step efficient and convenient synthesis of benzyl [1-14 C]-propiolate from 14 CO2 was therefore developed and utilized as a common synthon to afford practical and high yielding access to [1-14 C]-CA (PEG)n .
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