Asymmetric desymmetrization of σ-symmetrical diols: the role of chelation in the diastereoselective acetal cleavage induced by the chiral α-sulfinyl carbanion
摘要:
The reaction mechanism of beta-elimination in alpha-sulfinyl acetals was investigated using the chiral 3-oxo-thiochroman-1-oxide derivatives 1a and 1b. Our results show that the reaction is kinetically controlled with the C-O bond syn to the sulfinyl oxygen being cleaved exclusively. This reaction seems to proceed via six-membered ring chelation intermediates.
Asymmetric desymmetrization of σ-symmetrical diols: the role of chelation in the diastereoselective acetal cleavage induced by the chiral α-sulfinyl carbanion
摘要:
The reaction mechanism of beta-elimination in alpha-sulfinyl acetals was investigated using the chiral 3-oxo-thiochroman-1-oxide derivatives 1a and 1b. Our results show that the reaction is kinetically controlled with the C-O bond syn to the sulfinyl oxygen being cleaved exclusively. This reaction seems to proceed via six-membered ring chelation intermediates.