Synthesis and NMR Studies of <sup>13</sup>C-Labeled Vitamin D Metabolites<sup>1</sup>
作者:William H. Okamura、Gui-Dong Zhu、David K. Hill、Richard J. Thomas、Kerstin Ringe、Daniel B. Borchardt、Anthony W. Norman、Leonard J. Mueller
DOI:10.1021/jo011096y
日期:2002.3.1
proteins. Triple-labeled [7,9,19-(13)C(3)]-vitamin D(3) (56), its 25-hydroxylated and 1 alpha,25-dihydroxylated metabolites (58 and 68, respectively), and other labeled materials have been synthesized via coupling of [9-(13)C]-Grundmann's ketone 39 or its protected 25-hydroxy derivative 43 with labeled A ring enyne fragments 25 or 26. The labeled CD-ring fragment 39 was prepared by a sequence involving