Singh OV, Han H. Stereoselective Synthesis of trans-Olefins by the Copper-Mediated S(N)2' Reaction of Vinyl Oxazines with Grignard Reagents. Asymmetric Synthesis of D-threo-Sphingosines.
Tetrahedron Lett 2007;
48:2345-2348. [PMID:
18958293 PMCID:
PMC2572814 DOI:
10.1016/j.tetlet.2007.01.145]
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Abstract
The S(N)2' reaction of 6-vinyl-5,6-dihydro-4H-[1,3]oxazines with Grignard reagents in the presence of CuCN was studied, and high trans selectivity for the formation of double bond was observed with a variety of RMgX. The S(N)2' reaction, coupled with regioselective asymmetric aminohydroxylation reaction, provided a highly efficient route for the asymmetric synthesis of D-threo-N-acetylsphingosine.
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