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Chiral enolates of indolylacetyl derivatives 6a-f undergo addition to pyridinium salt 7 with complete trans-selectivity and varied diastereofacial selectivities to give, after acid-induced cyclization of the intermediate 1,4-dihydropyridines, the vinoxine-related tetracycles 8a-f. Starting from (S)-prolinol indolylacetamide 6e, subsequent elaboration of the ethylidene substituent from tetracycle 8e...
Anhydrous FeCl 3 in dry CH 2 Cl 2 removed benzyl ethers from carbohydrates containing p-bromobenzoate esters, without hydrogenolysis of the bromine atoms. In addition, debenzylations of β-glycopyranosides occurred with simultaneous anomerization or retention of the anomeric configuration.
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