Catalyst-Free Halogenation of α-Diazocarbonyl Compounds with <i>N</i>-Halosuccinimides: Synthesis of 3-Halooxindoles or Vinyl Halides
作者:Chaoqun Ma、Dong Xing、Wenhao Hu
DOI:10.1021/acs.orglett.6b01346
日期:2016.7.1
A novel catalyst-free halogenative cyclization of N-aryl diazoamides with N-halosuccinimides (NXS) is reported for the synthesis of 3-halooxindoles through a carbene-free mechanism. N-Aryl diazoamides reacted with NXS under mild and catalyst-free conditions to afford the corresponding 3-halooxindoles in good yields. This transformation is proposed to proceed through diazonium ion formation followed
A novel C–C bond formation by Baylis–Hillman type reaction mediated by SmI2: an effective approach to α-hydroxyalkylacrylamide synthesis
作者:So Won Youn、Heui Sul Park、Yong Hae Kim
DOI:10.1039/b006495p
日期:——
α-Bromoacrylamides (1) reacted with aldehydes or ketones, in the presence of SmI2 at −78 °C in THF, within 5 min to produce Baylis–Hillman type reaction products (2) through an anionic process using vinylsamarium Grignard species in good yields (52–89%).