New A-ring analogs of the hormone 1α,25-dihydroxyvitamin D3: (2′-hydroxymethyl)tetrahydrofuro[1,2-a]-25-hydroxyvitamin D3
作者:Heung Bae Jeon、Gary H. Posner
DOI:10.1016/j.tet.2008.12.034
日期:2009.2
and (S)- or (R)-2-(tert-butyldimethylsilyloxy)methyl-2,3-dihydrofuran, respectively. In addition, (2′-hydroxymethyl)tetrahydrofuro[1,2-a]-25-hydroxyvitamin D3 3a and 3b as new A-ring-modified analogs of the natural hormone 1α,25-dihydroxyvitamin D3 were readily synthesized by using Lythgoe-type coupling of the A-ring phosphine oxides (+)-4 and (−)-4 with C,D-ring ketone (+)-5.
从概念上讲,新的对映体纯净的双环四氢呋喃并[1,2 - a ] -A-环氧化膦(+)- 4和(-)- 4从2-pyrone-3-羧酸甲酯和(S)-或(R)-2-(叔丁基二甲基甲硅烷氧基)甲基-2,3-二氢呋喃。此外,(2'-羟甲基)四氢呋喃并[1,2一] -25羟基维生素d 3 图3a和3b中作为天然激素1α的新的A-环改性类似物,25-二羟基维生素d 3通过使用被容易地合成A环氧化膦(+)- 4和(-)- 4的Lygogoe型偶联带有C,D环酮(+)- 5。