Catalytic enantioselective Cr-mediated propargylation: application to halichondrin synthesis.
Catalytic enantioselective Cr-mediated propargylation: application to halichondrin synthesis.
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DOI:
10.1021/ol9016595
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发表时间:
2009-10-15
期刊:
影响因子:
5.2
通讯作者:
Kishi Y
中科院分区:
文献类型:
--
作者:
Liu S;Kim JT;Dong CG;Kishi Y
A catalytic enantioselective propargylation in the presence of 10 mol % Cr-catalyst prepared from Cr(III) bromide and (R)-sulfonamide E furnishes homopropargyl alcohol 8 in 78% yield with 90% ee. Coupled with the workup based on Amano-lipase, this method provides a practical synthesis of optically pure 8 in multi-gram scale. With maintenance of its optical purity, 8 has been converted to 5b, the C14-C19 building block of halichondrins and E7389, in 2 steps.
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