Vitamin D Heterocyclic Analogues; Part 2: Synthesis of the First Vitamin D Analogues with a Tetrazole Ring at the Side Chain

[摘要]：Access to the calcitriol analogues with a tetrazole ring at the side chain was very efficiently achieved using the Calverley-Choudhry approach instead of the Wittig-Horner method, which gave very low yields.

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