Carbamoylmethyl Radical Cyclization: Formal Synthesis of (-)-Trachelanthamidine.
作者:Tatsunori SATO、Katsuhiro TSUJIMOTO、Ken-ichiro MATSUBAYASHI、Kiroyuki ISHIBASHI、Masazumi IKEDA
DOI:10.1248/cpb.40.2308
日期:——
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.
三丁基氢化锡介导的 (2S)-N-(α-氯乙酰基)-2-乙烯基吡咯烷 13a, b 和 15 与来自 (S)-prolinol 的双(苯硫基)乙酰同系物-14 的自由基环化反应,以高区域和非对映选择性的方式得到了 (1R, 7aS)-hexahyrdo1-methyl-3H-pyrrolizin-3-one (17) 及其衍生物 16a, b。这种自由基环化方法成功地应用于 (-)-trachelanthamidine 的正式全合成。