Alfacalcidol (1α-hydroxyvitamin D3) is an important clinical drug for the treatment of osteoporosis. Its practical synthesis has been intensively pursued across academia. The difficulties of separating 5,6-cis and 5,6-trans isomers in the current process was avoided by photochemical transformation of the 5,6-trans isomer into the 5,6-cis isomer. Employing vitamin D3 as a starting material, alfacalcidol was
阿法骨化醇(1α-羟基
维生素D3)是临床上治疗骨质疏松症的重要药物。它的实际综合已经在学术界得到了广泛的研究。通过将 5,6- 反式异构体光
化学转化为 5,6- 顺式异构体,避免了当前方法中分离 5,6- 顺式和 5,6- 反式异构体的困难。以
维生素D3为原料,经酯化、环化、氧化、溶剂解开环、光
化学反应5步反应得到
阿法骨化醇。总收率从17%大幅提高到31%。