微波辅助合成2-芳基-2-恶唑啉,5,6-二氢-4 H -1,3-恶嗪和4,5,6,7-四氢-1,3-恶氮杂s
摘要:
提出了通过微波辅助多磷酸(PPA)酯促进的ω-氨基醇的环化反应合成5至7元环亚氨基醚的第一个通用程序。使用聚磷酸乙酯/ CHCl 3有效地制备了2-芳基-2-恶唑啉和5,6-二氢-4 H -1,3-恶嗪。在无溶剂条件下,多磷酸三甲基甲硅烷基酯可合成迄今未报道的4,5,6,7-四氢-1,3-氧杂氮杂pine。该方法具有良好的收率和优异的收率,并且反应时间短。在手性底物中研究了PPA酯的反应机理和作用。
S–Co(II) cascade catalysis: cyclocondensation of aromatic nitriles with alkamine
作者:Haixia Ge、Ping Liu、Xiangnan Li、Wei Sun、Jianli Li、Bingqin Yang、Zhen Shi
DOI:10.1016/j.tet.2013.05.132
日期:2013.8
A solvent-free S/Co(NO3)2 cascade catalyzed cyclocondensation reaction of aromaticnitriles with 3-amino-1-propanol or 2-aminoethanol has been successfully developed under thermal and microwave conditions. By this two-component protocol, mono- and bis-oxazines and oxazolines were selectively synthesized both in good to excellent yields and short reaction times. This catalytic system exhibits excellent
Transformations of pyridiniums derived from amino-alcohols and from diamines
作者:Alan R. Katritzky、Roland T. Langthorne、Ranjan C. Patel、Gerard Lhommet
DOI:10.1016/s0040-4020(01)88894-3
日期:1981.1
Pyridiniumsderivedfrom amino alcohols cyclise to ethers or rearrange to aldehydes on heating. Monopyridiniums from diamines can be acylated or converted into ureas or thioureas: these products cyclise on heating in solution to give dihydro-thiazoles, -4H-thiazines, -oxazoles, -4H-oxazines, or tetrahydro-3H-thiazepines.
A process for producing a thermoset resin, which comprises reacting (A) an organic compound containing at least two groups selected from the class consisting of alcoholic hydroxyl groups, aromatic amino groups and aromatic aminomethyl groups, and (B) a poly(cyclic iminoether) in the presence of (C) a compound acting as an acid catalyst, at an elevated temperature.