Citation: Mansour Nawasreh. Chemo-and regioselective hydroboration of △14,15 in certain cephalostatin analogue[J]. Chinese Chemical Letters, ;2008, 19(12): 1391-1394. doi: 10.1016/j.cclet.2008.09.055
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The symmetrical diketone Ⅱ, which can be synthesized in gram scale using a well established method, was used as a starting material to prepare the 11a-methoxy ketomethylene Ⅵ. This is in continuation of our study aiming at the synthesis of multi-hydroxylated cephalostatin analogues, as for example cephalostatin 1 Ⅰ, a potent anti-tumor natural product. Compound Ⅵ underwent chemo- and regioselective hydroboration reaction at only one of △14,15 double bonds furnishing compound Ⅸ as a major product in a fair yield.
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