ChemInform Abstract: CAL‐B‐Catalyzed Alkoxycarbonylation of A‐Ring Stereoisomeric Synthons of 1α,25‐Dihydroxyvitamin D3 and 1α,25‐Dihydroxy‐19‐nor‐previtamin D3: A Comparative Study. First Regioselective Chemoenzymatic Synthesis of 19‐nor‐A‐Ring Carbonates. | Publicación