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. 2001 Jul 23;57(30):6329-6343.
doi: 10.1016/S0040-4020(01)00499-9.

Stereocontrolled Synthesis of Quaternary β,γ-Unsaturated Amino Acids: Chain Extension of D- & L- α-(2-Tributylstannyl)Vinyl Amino Acids

David B Berkowitz  1 , Esmort Chisowa  1 , Jill M McFadden  1
Affiliations

Stereocontrolled Synthesis of Quaternary β,γ-Unsaturated Amino Acids: Chain Extension of D- & L- α-(2-Tributylstannyl)Vinyl Amino Acids

David B Berkowitz et al. Tetrahedron. .

Abstract

A pair of diastereomeric (4S,5S)- and (4S,5R)-4-methoxycarbonyl-5-phenylselenomethyl-2-phenyl oxazolines, derived from L-vinylglycine, serve as precursors to protected, quaternary, L- and D-α-(2-tributylstannyl)vinyl amino acids, respectively, in three steps {(i) alkylative side chain installation, (ii) eliminative ring-opening and (iii) vinyl selenide to vinyl stannane interconversion}. The title compounds may be protodestannylated to the corresponding free, quaternary L- and D-vinyl amino acids. Alternatively, the 2-stannylvinyl α-branch (or the derivative 2-iodovinyl branch) may be exploited to access novel quaternary, L- and D-β,γ-unsaturated amino acids via a range of transition metal-mediated cross coupling reactions.

Keywords: chain extension; self regeneration of stereocenters (SRS); vinyl selenides; vinyl stannanes; β; γ-unsaturated amino acids.

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See this image and copyright information in PMC

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