A Novel Transformation of Four Aldoses to Some Optically Pure Pseudohexopyranoses and a Pseudopentofuranose, Carboxylic Analogues of Hexopyranoses and Pentofuranose. Synthesis of Derivatives of (1S,2S,3R,4S,5S)-, (1S,2S,3R,4R,5S)-, (1R,2R,3R,4R,5S)-, (1S,

Article abstract of DOI:10.1021/jo00386a011

Knoevenagel reactions with dimethyl malonate of the suitably protected acylic aldehydes 6, 20, 34, and 46, which were prepared from D-ribose, D-xylose, D-arabinose, and D-erythrose, respectively, proceeded smoothly to provide α,β-unsaturated diesters 7, 2