Studies towards a total synthesis of sarains A-C. Stereospecific condensation of α,β-unsaturated esters with the phenyl oxazoline derivative of threonine
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Add time:09/04/2019 Source:sciencedirect.com
Michael addition of oxazoline lithium enolate 5 to E and Z α,β-unsaturated esters proceeds with high enoate facial selectivity to yield enantiopure oxazoline derivatives of disubstituted glutamic acids. When a Z enoate is employed, the C4′-C3′-C7′ stereotriad of sarains A-C can be generated.
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