Radical 6-<i>endo</i>-<i>trig</i> Cyclization of β,β-Difluoro<i>-o</i>-isocyanostyrenes: A Facile Synthesis of 3-Fluoroquinolines and Their Application to the Synthesis of 11-Alkylated Cryptolepines
作者:Junji Ichikawa、Takashi Mori
DOI:10.1055/s-2007-977424
日期:2007.4
o-Isocyano-substituted β,β-difluorostyrenes undergo tin-mediated radical cyclization in a 6-endo-trig fashion, followed by: (i) transformation of the C-Sn bond, and (ii) dehydrofluorination or reduction, leading to 2,4-disubstituted 3-fluoroquinolines or 3,3-difluorotetrahydroquinolines. This sequence was successfully applied to the synthesis of 11-alkylated cryptolepines.
o-异氰基取代的δ,δ-二氟苯乙烯以 6-endo-trig 方式发生锡介导的自由基环化,然后:(i) C-Sn 键的转化,以及 (ii) 脱氢氟化或还原,从而得到 2,4-二取代的 3-氟喹啉或 3,3-二氟四氢喹啉。这一步骤被成功地应用于合成 11-烷基隐烯烃。