Cyclization and Fragmentation of <i>N</i>-Chloro Lactams. The Transannular Synthesis of Bicyclic Lactams with Bridgehead Nitrogen
作者:O. E. Edwards、J. M. Paton、M. H. Benn、R. E. Mitchell、Churai Watanatada、K. N. Vohra
DOI:10.1139/v71-269
日期:1971.5.15
High yield peroxide initiated and photochemical conversion of N-chloroazacyclooctanone to 5-chloroazacyclooctanone and of N-chloroazacyclononanone to a mixture of azabicyclo[4.3.0]nonan-2-one and azabicyclo[4.3.0]nonan-9-one is described. N-Chloro-2-azabicyclo[2.2.2]octan-3-one gave 4-chlorocyclohexylamine derivatives under similar conditions, while N-chloro-N-methylpentanoamide gave γ-valerolactone
Photoinduced C(sp<sup>3</sup>)–H chlorination of amides with tetrabutyl ammonium chloride
作者:Yanshuo Zhu、Wei Yu
DOI:10.1039/d1ob02081a
日期:——
developed for the site-selective C(sp3)–H chlorination of amides with tetrabutyl ammonium chloride as the chlorinating agent. The reaction features a tandem sequence that involves a (diacetoxyiodo)benzene-mediated and chloride anion-involved N–H chlorination followed by photoinitiated chlorineatom transfer. A wide variety of carboxamides and sulfonamides were chlorinated at the δ-position by using this method
Photoinduced Site-Selective C(sp<sup>3</sup>)–H Chlorination of Aliphatic Amides
作者:Yanshuo Zhu、Jingcheng Shi、Wei Yu
DOI:10.1021/acs.orglett.0c03297
日期:2020.11.20
Herein, we report a newphotochemical method for C(sp3)–H chlorination of amides which employs tert-butyl hypochlorite as the chlorinating agent and a household compact fluorescent lamp as the light source. The reaction proceeds via N-heterocyclic carbene SIPr·HCl-promoted N–H chlorination and subsequent photoinduced Hofmann–Löffler–Freytag chlorine atom transfer. The latter process is facilitated