We describe an efficient synthesis of thia analogues of the vitaminDsidechain that is based on the in situ generation of a thiolate anion and its alkylation with electrophiles.
The design and efficient preparation of two 20-epi analogues of calcitriol with restricted side chain conformation is described. The formation of the tetrahydropyran ring was achieved via zincchloride mediated etherification of alcohols. Docking experiments show that these novel analogues could be interesting synthetic targets.
An efficient new method for the construction of vitaminD hydroxylated sidechains is described which is based on the alkylation and opening of epoxides by the ga-anions derived from nitriles 6 and 7.
Synthesis and vitamin D receptor affinity of 16-oxa vitamin D<sub>3</sub> analogues
作者:Kouta Ibe、Takeshi Yamada、Sentaro Okamoto
DOI:10.1039/c9ob02339a
日期:——
Two novel 16-oxa-vitamin D3 analogues were synthesized using a tandem Ti(II)-mediated enyne cyclization/Cu-catalyzed allylation, Ru-catalyzed ring-closing metathesis reaction, and a low-valent titanium (LVT)-mediated stereoselective radical reduction of 8α,14α-epoxide as the key steps for the synthesis of the 16-oxa-C,D ring unit. The vitamin D receptor-binding affinity of the synthesized analogues
DIASTEREOMERS OF 2-METHYLENE-19-NOR-22-METHYL-1ALPHA,25-DIHYDROXYVITAMIN D3
申请人:DeLuca Hector F.
公开号:US20110237557A1
公开(公告)日:2011-09-29
Compounds of formula I are provided where X
1
, X
2
, and X
3
are independently selected from H or hydroxy protecting groups. Such compounds may be used in preparing pharmaceutical compositions and are useful in treating a variety of biological conditions.