Synthesis and biological activity of 1.ALPHA.-hydroxy-24,24-dimethyl-22E-dehydrovitamin D3 and 1.ALPHA.,25-dihydroxy-24,24-dimethyl-22E-dehydrovitamin D3.
作者:HIROSHI SAI、SUGURU TAKATSUTO、NOBUO IKEKAWA
DOI:10.1248/cpb.33.4815
日期:——
Two new vitamin D3 analogues, 1α-hydroxy-24, 24-dimethyl-22E-dehydrovitamin D3 (13) and 1α, 25-dihydroxy-24, 24-dimethyl-22E-dehydrovitamin D3 (17), which are blocked for 24-hydroxylation by the methyl groups, were synthesized from 1α, 3β-bismethoxymethoxypregn-5-ene-20Scarbaldehyde (6) by using the orthoester Claisen rearrangement for construction of the carbon skeleton of their side chains. These compounds (13 and 17) elicited a rise in serum calcium, but not in serum inorganic phosphorus in rats. In a bioassay for alkaline phosphatase, they were found to show much weaker activity than 1α-hydroxy vitamin D3 (5).
两种新的维生素 D3 类似物,即 1α-羟基-24,24-二甲基-22E-脱氢维生素 D3 (13) 和 1α,25-二羟基-24,24-二甲基-22E-脱氢维生素 D3 (17),被甲基阻断了 24-羟基化、由 1α,3β-bismethoxymethoxypregn-5-ene-20-Scarbaldehyde(6)通过正交酯克莱森重排法合成,以构建其侧链的碳骨架。这些化合物(13 和 17)会引起大鼠血清钙的升高,但不会引起血清无机磷的升高。在碱性磷酸酶的生物测定中,发现它们的活性比 1α- 羟基维生素 D3 弱得多(5)。