200636-22-2Relevant articles and documents
Synthesis of 20-epi-eldecalcitol [20-epi-1α,25-dihydroxy-2β-(3-hydroxypropoxy)vitamin D3: 20-epi-ED-71]
Yoshino, Madoka,Eto, Kohei,Takahashi, Keisuke,Ishihara, Jun,Hatakeyama, Susumi,Ono, Yoshiyuki,Saito, Hitoshi,Kubodera, Noboru
scheme or table, p. 381 - 394 (2010/09/05)
A convergent synthesis of biologically interesting 20-epi-eldecalcitol which possesses an inverted C-21 methyl substituent at the 20-position of the side chain of 1α,25-dihydroxy-2β-(3-hydroxypropoxy)vitamin D3 (eldecalcitol) is described.
Synthesis and biological characterization of 1α,24,25-trihydroxy-2β-(3-hydroxypropoxy)vitamin D3 (24-hydroxylated ED-71)
Hatakeyama, Susumi,Kawase, Akira,Uchiyama, Yasushi,Maeyama, Junji,Iwabuchi, Yoshiharu,Kubodera, Noboru
, p. 267 - 276 (2007/10/03)
24-Hydroxylated derivatives were synthesized in 24(R) and 24(S) forms by the convergent method as analogs related to 1α,25-dihydroxy-2β-(3-hydroxypropoxy)vitamin D3. In the convergent synthesis, the A-ring fragment, synthesized from diethyl D-tartarate, and the C/D-ring fragments in 24(R) and 24(S) forms (vitamin D numbering), obtained from vitamin D2 via the Inhoffen-Lythgoe diol, were coupled in moderate yields to give 1α,24(R),25-trihydroxy-2β-(3-hydroxypropoxy)vitamin D3 and 1α,24(S),25-trihydroxy-2β-(3-hydroxypropoxy)vitamin D3. In preliminary biological evaluations, 24-hydroxylation of 1α,25-dihydroxy-2β-(3-hydroxypropoxy)vitamin D3 caused weakened affinity to vitamin D binding protein in vitro and less calcemic activity in vivo compared to the parent compound. While the affinity to vitamin D receptor in 24(R) epimer was sustained, the affinity in 24(S) epimer was less than that of the parent compound. Copyright