Pyrrolidine and tetrahydrofuran derivatives were synthesized in a highly stereoselective manner through the Ni-catalyzed reduction of the title compounds under mild conditions (see scheme). The product of cyclization is initially associated with both a Ni and a Zn species, the removal of which by elimination and hydrolysis corresponds to the formal incorporation of dihydrogen. acac=acetylacetonate; R=alkyl, aryl; X=N, O.
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Chen et al. (2008) studied this question.
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