Citation: Shi Feng, Li-Fei Cui, He-Geng Wei, Guo-Jun Zheng, Ya-Ping Wang, Xiang-Jing Wang, Ji Zhang, Wen-Sheng Xiang. Improved and efficient synthesis of Maxacalcitol[J]. Chinese Chemical Letters, ;2014, 25(05): 771-774. doi: 10.1016/j.cclet.2014.03.001
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Maxacalcitol, the 22-oxa-derivative of 1α, 25-dihydroxyvitamin D3, has been used as an antihyperparathyroidism and antipsoriatic drug. In this paper, an alternative synthetic route has been developed using commercially available vitamin D2 as the starting material. In addition, as a key intermediate, the asymmetric synthesis of 20(S)-alcohol 14 with the chiral auxiliary (R-CBS) was described for the first time. This new synthetic route afforded Maxacalcitol with improved overall yield (13.9%) in eleven steps.
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Keywords:
- Vitamin D3 derivative,
- Maxacalcitol,
- Synthesis,
- Asymmetric reduction
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