Synthesis of Chiral Tetrasubstituted Azetidines from Donor–Acceptor Azetines via Asymmetric Copper(I)‐Catalyzed Imido‐Ylide [3+1]‐Cycloaddition with Metallo‐Enolcarbenes |
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Authors: | Kostiantyn O Marichev Kan Wang Kuiyong Dong Nicole Greco Lyne A Massey Yongming Deng Hadi Arman Michael P Doyle |
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Institution: | Kostiantyn O. Marichev,Kan Wang,Kuiyong Dong,Nicole Greco,Lynée A. Massey,Yongming Deng,Hadi Arman,Michael P. Doyle |
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Abstract: | The all‐cis stereoisomers of tetrasubstituted azetidine‐2‐carboxylic acids and derivatives that possess three chiral centers have been prepared in high yield and stereocontrol from silyl‐protected Z‐γ‐substituted enoldiazoacetates and imido‐sulfur ylides by asymmetric 3+1]‐cycloaddition using chiral sabox copper(I) catalysis followed by Pd/C catalytic hydrogenation. Hydrogenation of the chiral p‐methoxybenzyl azetine‐2‐carboxylates occurs with both hydrogen addition to the C=C bond and hydrogenolysis of the ester. |
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Keywords: | Azetidine Azetine Cycloaddition Hydrierung Kupferkatalyse |
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