threo‐3‐Alkyl‐ and ‐Arylglutamic Acid Derivatives by Michael Additions of Boc‐BMI Li‐Enolates to 2,6‐Di‐t‐butyl‐4‐methoxyphenyl Alkenoates on the Diastereoselectivity of the Coupling of Trigonal Centers Involving Heterocyclic Li‐Enolates

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