A modified Bischler-Napieralski procedure for the synthesis of 3-aryl-3,4-dihydroisoquinolines
作者:Robert D. Larsen、Robert A. Reamer、Edward G. Corley、Paul Davis、Edward J. J. Grabowski、Paul J. Reider、Ichiro Shinkai
DOI:10.1021/jo00021a014
日期:1991.10
A modification of the Bischler-Napieralski reaction for the cyclization of (1,2-diphenylethyl)amides to the 3-aryl-3,4-dihydroisoquinolines is presented. Elimination of the amide group as the nitrile via the retro-Ritter reaction is avoided by its conversion to an N-acyliminium intermediate with oxalyl chloride-FeCl3. Removal of the oxalyl group in refluxing MeOH-sulfuric acid provides the 3,4-dihydroisoquinolines in moderate to high yields. The method is also highly effective with (2-phenylethyl)amides.
Narasimhan, N. S.; Wadia, M. S.; Shete, N. R., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1980, vol. 19, # 7, p. 556 - 560
作者:Narasimhan, N. S.、Wadia, M. S.、Shete, N. R.
DOI:——
日期:——
NARASIMHAN N. S.; WADIA M. S.; SHETE N. R., INDIAN J. CHEM., 1980, B 19, NO 7, 556-560
作者:NARASIMHAN N. S.、 WADIA M. S.、 SHETE N. R.
DOI:——
日期:——
Synthesis of 3,4-Dihydroisoquinolines by a C(sp<sup>3</sup>)H Activation/Electrocyclization Strategy: Total Synthesis of Coralydine
Thanks to CHactivation: 3‐Aryl‐3,4‐dihydroisoquinolines (2) are synthesized from bromobenzenes (1) by a sequence comprising a C(sp3)Hactivation, a Curtius rearrangement, and a tandem electrocyclic ring‐opening/6π electrocyclization. This method is applied to the synthesis of various isoquinoline‐containing molecules, including the tetrahydroprotoberberine alkaloid coralydine.