25-Hydroxytachysterol3
IUPAC 名称
2-[(E)-2-[(1R,7aR)-1-[(2R)-6-hydroxy-6-methylheptan-2-yl]-7a-methyl-2,3,3a,6,7,7a-hexahydro-1H-inden-4-yl]ethenyl]-3-methylcyclohex-2-en-1-ol
描述
25-Hydroxytachysterol3 is a hydroxylated derivative of tachysterol3. 25-hydroxytachysterol is converted to 25-hydroxyprevitamin D3, which is then converted to the hydroxyvitamin D3 through a thermally induced rearrangement. It is now established that, during exposure to sunlight, the cutaneous reservoir of 7-dehydrocholesterol converts to previtamin D3. Once this thermally labile previtamin is formed, it undergoes a temperature-dependent isomerization to vitamin D3 over a period of 3 days. The plasma vitamin-D binding protein preferentially translocates vitamin D3 from the skin into the circulation. During prolonged exposure to the sun, the accumulation of previtamin D3 is limited to about 10 to 15% of the original 7-dehydrocholesterol content because the previtamin photoisomerizes to 2 biologically inert photoproducts, lumisterol3 and tachysterol3. (PMID 12617640). 25-Hydroxytachysterol3 is characterized by antirachitic activity and by its ability to elevate serum calcium concentration in conditions of hypoparathyroidism. 25-Hydroxytachysterol3 can be used in the preparation of 25-hydroxydihydrotachysterol 3 (25-OH-DHT3) is considered an effective adjunct in the treatment of hypoparathyroidism, particularly where rapid action in elevating serum calcium concentration is being sought. (25-OH-DHT3) exhibits substantially greater antirachitic activity than DHT 3 [HMDB]
异构
C[C@H](CCCC(C)(C)O)[C@H]1CCC2([H])C(=CCC[C@]12C)\C=C\C1=C(C)CCCC1O
InChI标识符
InChI=1S/C27H44O2/c1-19-9-6-12-25(28)22(19)14-13-21-11-8-18-27(5)23(15-16-24(21)27)20(2)10-7-17-26(3,4)29/h11,13-14,20,23-25,28-29H,6-10,12,15-18H2,1-5H3/b14-13+/t20-,23-,24?,25?,27-/m1/s1
键
REBCKWLPJGCBRY-GYDNJJFKSA-N