Chemistry. The synthetic approach utilized for the preparation of the N44 (dialky1amino) alkyll-W-phenyl-2, 4-quinazolinediamines (VI) involved modifications of previous5p6 procedures and is depicted in Scheme I. Condensation of the appropriate 2, 4- dichloroquinazoline (IV) with the requisite N, N-dialkylalkylenediamine in ether, alcohol- ether, alcohol, nitrobenzene, or dilute aqueous sodium hydroxide5 generated the ...