Radical aromatic substitution via atom-transfer addition
作者:Jeffrey H. Byers、John E. Campbell、Faith H. Knapp、Jameson G. Thissell
DOI:10.1016/s0040-4039(99)00304-4
日期:1999.4
New methodology for radical aromaticsubstitution has been developed involving the addition of electron-deficient radicals to unprotected pyrroles and indole. This non-oxidative process is presumed to be occurring via atom-transfer addition of suitable organoiodides and bromides with subsequent non-radical elimination of HI or HBr, respectively. The process also occurs under stannane-free conditions
Facile Preparation of (±)-12-Epiprostaglandins from 7-Oxabicyclo[2.2.1]hept-5-en-2-one<i>via</i>an all-<i>cis</i>-formyllactone related to<i>Corey</i>lactone
作者:Jean-Paul Vionnet、Philippe Renaud
DOI:10.1002/hlca.19940770710
日期:1994.11.2
The bicyclic monoselenoacetal 7, easily obtained from (±)-7-oxabicyclo[2.2.1]hept-5-en-2-one (6) via a radical addition-acyl migration sequence, was converted to racemic 12-epiprostaglandins 3 and 4. The key intermediate was the all-cis-formyllactone 2b related to Corey lactone (see 12; Scheme 1). The presence of a (tert-butyl)-dimethylsilyl protective group for the 11-OH substituent (prostaglandin
作者:Jeffrey H. Byers、Brendan M. O'Leary、Maggie A. Zraly
DOI:10.1080/00397919608003825
日期:1996.11
Abstract The photolytic radical addition of phenylselenomalonates to allylic alcohols, followed by acid-catalyzed cyclization yields valerolactones incorporating a phenylseleno substituent.
The formal syntheses of (±)-nephromopsinic acid, (−)-phaseolinicacid, and the first total synthesis of (−)-dihydropertusaric acid from (±)- and (−)-7-oxabicyclo[2.2.1]hept-5-en-2-one are described. These syntheses take advantage of a previously reported radical rearrangement (1,2-acyl migration). A remarkable iodide-mediated cleavage of a bicyclic system, followed by the introduction of the γ-chains