Two-Step Synthesis of 1,3-Disubstituted 3,4-Dihydro-4-thioxoquinazolin-2(1H)-ones from 1-Bromo-2-fluorobenzenes
作者:Kazuhiro Kobayashi、Toshihide Komatsu、Yuki Yokoi、Hisatoshi Konishi
DOI:10.1002/hlca.201000327
日期:2011.1
An efficient synthesis of 3‐alkyl‐3,4‐dihydro‐4‐thioxobenzoquinazolin‐2(1H)‐ones 3 has been accomplished in two steps and in satisfactory yields from 1‐bromo‐2‐fluorobenzenes 1. Thus, the reaction of 1‐fluoro‐2‐lithiobenzenes, generated by the Br/Li exchange between 1 and BuLi, with alkyl isothiocyanates, gives N‐alkyl‐2‐fluorobenzothioamides 2, which, in turn, react with a series of isocyanates in
1-溴-2-氟代苯1的两步反应可令人满意地合成3-烷基-3-3,4-二氢-4-噻吩并苯并喹啉2(1 H)-酮3。因此,由1和BuLi之间的Br / Li交换产生的1-氟-2-锂基苯硫醚与烷基异硫氰酸酯反应,生成N-烷基-2-氟苯硫基酰胺2,后者又与一系列异氰酸酯反应在NaH存在下得到所需的产品3。