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note
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We have also made the reactions of 1c with MeLi (1.3 eq) in the presence of methylaluminum bis (2,4,6-tritert-butyl-phenoxide). Nevertheless the use of MAT did not improve the stereoselectivity and the chemical yield was even lower than under other conditions used in Table 1.
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19
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85031216911
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note
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1H-δ values as well by assuming a similar stereochemical course for all these reactions.
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20
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85031230085
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note
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Partial or complete Al-Zn exchange resulting in the formation of A from B species can not be disregarded.
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We used the protected β-ketoester 4 as the starting material to avoid the presumably negative influence of the free carbonyl on the stereoselectivity of the β-kelosulfoxide reduction. Nevertheless, Solladié showed that this protection was not necessary (Solladié, G.; Ghiatou , N. Tetrahedron Lett., 1992, 33, 1605).
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