299410-97-2

Upstream product

• 18162-48-6 tert-butyldimethylsilyl chloride 
• 299410-93-8 methyl 4,6-O-benzylidene-3-O-(3-hydroxypropyl)-α-D-altropyranoside 
• 299410-95-0 methyl 4,6-O-benzylidene-3-O-[3-{(tert-butyldimethylsilyl)oxy}propyl]-α-D-altropyranoside 

Downstream Products

• 794516-09-9 (2R,3S,4R)-4-benzoyloxy-3-[3-(tert-butyldimethylsilyloxy)propoxy]hex-5-ene-1,2-diol 
• 104121-92-8 Eldecalcitol 
• 794516-11-3 (3R,4R,5R)-3-benzoyloxy-4-[3-(tert-butyldimethylsilyloxy)propoxy]-5,6-epoxyhex-1-ene 
• 357332-31-1 (R)-6-{(1R,3aS,7aR)-4-[2-[(3R,4S,5R)-3,5-Bis-(tert-butyl-dimethyl-silanyloxy)-4-[3-(tert-butyl-dimethyl-silanyloxy)-propoxy]-2-methylene-cyclohex-(Z)-ylidene]-eth-(E)-ylidene]-7a-methyl-octahydro-inden-1-yl}-2-methyl-heptan-2-ol 

Relevant academic research and scientific papers

Design and efficient synthesis of 2α-(ω-hydroxyalkoxy)- 1α,25-dihydroxyvitamin D3 analogues, including 2-epi-ED-71 and their 20-epimers with HL-60 cell differentiation activity

A concise and efficient synthetic approach to 2α-(ω- hydroxyalkoxy)-1α,25-dihydroxyvitamin D3 (4a-c), including 2-epi-ED-71, was developed starting from D-glucose as a chiral template for the construction of the 2α-modified A-ring precursors (11a-c). It was found that the best ligand for the bovine thymus vitamin D receptor (VDR) in this series is 4b, which has 1.8 times greater binding affinity for the bovine thymus VDR than that of the natural hormone 1. Interestingly, potency in the induction of HL-60 cell differentiation for 4a-c was almost the same or weaker than that of 1 despite the strong binding affinity for the VDR. Next, we were interested in the "double modification" of 1 based on 4a-c with C20-epimerization, affording 2α-(ω-hydroxyalkoxy)-20-epi-1α, 25-dihydroxyvitamin D3 (20-epi-4a-c). All three 2α-substituted 20-epi analogues of 1 (20-epi-4a-c) exhibited stronger binding affinities for the VDR, and their conformations in the ligand binding domain of VDR were analyzed by molecular modeling. Double-modified analogues of 20-epi-4a-c showed marked HL-60 cell differentiation activity, and 20-epi-4a possesses an activity 58-fold higher than that of the natural hormone 1.

Vitamin d derivatives having substituents at the 2 alpha-position

An object of the present invention is to synthesize a novel vitamin D derivative having a substituent at the 2α-position. According to the present invention, there is provided a vitamin D derivative of Formula (1): wherein R1 and R2

A concise and efficient route to 2alpha-(omega-hydroxyalkoxy)-1alpha,25-dihydroxyvi tam in D3: remarkably high affinity to vitamin D receptor.

[reaction: see text]A convenient and potentially valuable synthetic approach to the novel 2alpha-functionalized 1alpha,25-dihydroxyvitamin D3 [1alpha,25(OH)2D3] derivatives (1a-c), which are the C2-epimer of ED-71 and its analogues, has been developed. Th