212912-47-5Relevant articles and documents
NOREPHEDRINE DERIVED 2-METHOXY OXAZOLIDINES AS CHIRAL FORMYL CATION EQUIVALENTS
Bernardi, Anna,Cardani, Silvia,Carugo, Oliviero,Colombo, Lino,Scolastico, Carlo,Villa, Roberto
, p. 2779 - 2782 (2007/10/02)
Lewis acid catalyzed reaction of silylenolethers with 1 followed by a straightforward nondestructive removal of the chiral auxiliary affords the corresponding aldehydes in good e.e.Compound 1 respresents the first effective synthetic equivalent of formyl cation.
Asymmetric synthesis by the use of norephedrine-derived 2-methoxy-oxazolidines. Part four: the synthesis of enantiomerically enriched polyhydroxylated building blocks
Bernardi, A.,Piarulli, U.,Poli, G.,Scolastico, C.,Villa, R.
, p. 751 - 757 (2007/10/02)
The Lewis acid promoted addition of five silylketeneacetals to norephedrine derived 2-methoxy oxazolidines allowed the stereoselective incorporation of an oxy function vicinal to the oxazolidinic C-2 position.Subsequent functional group modification and/or non destructive chirophor removal, afforded enantiomerically enriched polyhydroxylated building blocks such as (S)-di-O-benzyl glyceraldehyde and D-ribose propane-1,3 diyldithioacetal.A rational accounting for the selectivity of the coupling steps is proposed.Keywords: asymmetric synthesis / norephedrine / (S)-di-O-benzylglyceraldehyde / D-ribose propane-1,3-diyldithioacetal