One-Pot Synthesis of 1,4-Dihydro-2-thioxo-2H-3,1-benzoxazine-4-acetic Acid Derivatives by the Reaction of 2-Isothiocyanatophenyl Ketones with Lithium Enolates of Acetates and Tertiary Acetamides
作者:Kazuhiro Kobayashi、Shuhei Fukamachi、Akihiro Kobayashi、Aogu Gotoh
DOI:10.1002/hlca.201200096
日期:2012.9
one‐pot synthesis of 4‐aryl‐1,4‐dihydro‐2‐thioxo‐2H‐3,1‐benzoxazine‐4‐acetic acid derivatives 2 was achieved in good yields by the reaction of aryl(2‐isothiocyanatophenyl)methanones 1 with lithium enolates of acetates and tertiary acetamides. (2E)‐1‐(2‐Isothiocyanatophenyl)‐3‐phenylprop‐2‐en‐1‐one (3) gave 1,4‐dihydro‐4‐[(1E)‐2‐phenylethenyl]‐2‐thioxo‐2H‐3,1‐benzoxazine‐4‐acetic acid derivatives 4 in good
通过芳基(2-异硫氰酸根合苯基)的反应可实现高收率的一锅合成4-芳基-1,4-二氢-2-硫代氧杂2 H -3,1-苯并恶嗪-4-乙酸衍生物2甲酮1与乙酸乙烯酯和叔乙酰胺的烯醇锂。(2 E)-1-(2-异硫氰酸根合苯基)-3-苯基丙-2-烯-1-酮(3)得到1,4-二氢-4-[[(1 E)-2-苯基乙烯基] -2-硫代‐2 H ‐3,1-苯并恶嗪-4-乙酸衍生物4的收率也很高。