Oxidation of Biginelli Reaction Products: Synthesis of 2-Unsubstituted 1,4-Dihydropyrimidines, Pyrimidines, and 2-Hydroxypyrimidines
作者:Hyunik Shin、Sam Kim、Bo Choi、Jae Lee、Ki Lee、Tae Lee、Young Kim
DOI:10.1055/s-0028-1087920
日期:2009.3
from the Biginelli product, dihydropyrimidin-2(1H)-thiones in two steps: Oxidation of dihydropyrimidin-2(1H)-thiones using oxone on wet alumina or hydrogen peroxide in the presence of catalytic amount of vanadyl sulfate provided 1,4-di-hydropyrimidine, which was further oxidized to 2-unsubstituted pyrimidines by the treatment of KMnO 4 . Oxidation of dihydropyrimidin-2(1H)-ones by KMnO 4 formed 2-hydroxypyrimidine
Selective reductive cleavage of 2-(phenylthio)pyrimidines for efficient synthesis of 2-(H)pyrimidines
作者:Yujin Oh、Jihong Lee、Hyunik Shin、Jeong-Hun Sohn
DOI:10.1016/j.tetlet.2019.07.002
日期:2019.8
cleavage of 2-(phenylthio)pyrimidines using Pd(OAc)2 and Et3SiH to produce 2-(H)pyrimidines. The reaction proceeds efficiently with a wide range of 2-(phenylthio)pyrimidines. Considering the ready availability of 2-(arylthio)pyrimidines derived from oxidative CS cross coupling of 3,4-dihydropyrimidin-1H-2-thiones (DHPMs), this method unambiguously provides a shortcut to the preparation of 2-(H)pyrimidines
描述了使用Pd(OAc)2和Et 3 SiH选择性还原切割2-(苯硫基)嘧啶以生成2-(H)嘧啶的反应方法。该反应在广泛范围的2-(苯硫基)嘧啶中有效地进行。考虑到3,4-二氢嘧啶-1 H -2-硫酮(DHPM)的氧化C S交叉偶联衍生的2-(芳硫基)嘧啶的可用性,该方法无疑为制备2-(H)提供了捷径嘧啶具有前所未有的多样性。