Ruthenium Complex-Catalyzed Reaction of Isocyanoacetate and N-Sulfonylimines: Stereoselective Synthesis of N-Sulfonyl-2-Imidazolines
摘要:
Ruthenium(II)-catalyzed reaction of N-sulfonylimines with methyl isocyanoacetate proceeds efficiently under neutral, mild conditions to give trans-2-imidazolines stereoselectively in high yields. 2,3-Diamino acids can be easily acquired via the hydrolysis of the imidazolines in excellent yields. A possible mechanism for the ruthenium-catalyzed aldol reaction of the imines under neutral conditions is discussed.