Carbamoylmethl Radical Cyclization : Formal Synthesis of (-)-Trachelanthamidine

Carbamoylmethl Radical Cyclization : Formal Synthesis of (-)-Trachelanthamidine
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氨基甲酰基甲基自由基环化:(-)-曲海兰脒的正式合成

DOI:
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发表时间:
1992
期刊:
影响因子:
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通讯作者:
M. Ikeda
M. Ikeda
中科院分区:
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文献类型:
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作者:
Tatsunori Sato;K. Tsujimoto;K. Matsubayashi;K. Ishibashi;M. Ikeda

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(2S)-N-(α-氯乙酰基)-2-乙烯基吡咯烷13 a,B和15与(S)-脯氨醇衍生的双苯硫基乙酰基同系物14在三丁基锡醚的催化下发生自由基环化反应,以高度区域选择性和非对映选择性的方式得到(1 R,7aS)-六氢-1-甲基-3H-吡咯嗪-3-酮(17)及其衍生物16 a,B b。该自由基环化反应成功地应用于(-)-络石脒的形式化全合成。
Tributyltin hydride-mediated radical cyclization of the (2S)-N-(α-chloroacetyl)-2-ethenylpyrrolidines 13a, b and 15 and the bis(phenylthio)acetyl congener-14 derived from (S)-prolinol gave (1R, 7aS)-hexahyrdo1-methyl-3H-pyrrolizin-3-one (17) and its derivatives 16a, b in highly regio- and diastereo-selective manner. This radical cyclization was successfully applied to the formal total synthesis of (-)-trachelanthamidine.