Hexamethyldisilazane-iodine induced intramolecular dehydrative cyclization of diamides: a general access to natural and unnatural quinazolinones
摘要:
A simple and efficient general approach to various quinazolinone scaffolds, including peptidomimetic examples, has been demonstrated by employing HMDS/I-2 for the intramolecular dehydrative cyclization of diamides. The protecting groups -Boc, -Fmoc and -Cbz tolerated the present reaction conditions and we did not observe any racemization. The present protocol has also been used as a key step for the efficient four-step syntheses of the naturally occurring quinazolinones, sclerotigenin, (-)-circumdatin-F and (-)-fumiquinazoline-F. (c) 2007 Elsevier Ltd. All rights reserved.
One-Pot Three-Component Synthesis of 4(3H)-Quinazolinones from Benzyl Halides, Isatoic Anhydride, and Primary Amines
作者:Mehdi Adib、Ehsan Sheikhi、Hamid Bijanzadeh
DOI:10.1055/s-0031-1290098
日期:2012.1
A novel, one-pot, and three-component synthesis of 4(3H)-quinazolinones is described. Benzyl halides are oxidized to aldehydes under mild Kornblum conditions then undergo a three-component reaction with isatoic anhydride and primary amines to produce 4(3H)-quinazolinones in excellent yields. benzyl halides - Kornblum oxidation - isatoic anhydride - amines - 4(3H)-quinazolinones - multicomponent reactions