The Synthesis of an Optically Active Intermediate of A-Ring for 1α,25-Dihydroxy Vitamin D_3 Analogs

Synthesis of an optically active intermediate 4b for the A-ring of 1a,25-dihydroxyvitamin D3 analogs has been achieved in eight steps, starting from readily available, inexpensive D-(+)-xylose.

Two Chiral Building Blocks for the Stereocontrolled Synthesis of Anti-and Syn-1,3-Diols

Two chiral building blocks 1 and 2 for anti-and syn-1, 3-diols has been achieved in 8 steps and 7 steps respectively, starting from the readily available and inexpensive D (+)-xylose 3.

Synthesis of an Anti-1,3-Diol Type Chiral Building Block

A chiral building block, anti-1,3-diol 2, has been synthesized in 7 steps, starting from readily available and inexpensive D-(+)-xylose.