Synthesis of 13 α-Substituted-des- C-ring-19-nor-1 α,25- dihydroxyvitamin D 3 Analogs
Cai Zuyun, DeLuca Hector F.
Chin. J. Org. Chem. . 2014, (8): 1582 -1587 .  DOI: 10.6023/cjoc201402015