合成了一系列2-氧代-3(2 H)-苯并恶唑乙酸乙酯衍生物2。通过与氨,伯胺或肼反应,将这些化合物2分别转化为1-(2-羟苯基)-2,4-咪唑烷二酮衍生物4、5和6。这些新的乙内酰脲4,用三氯氧磷处理后,得到3 H -2-氧代咪唑并[2,1- b ]苯并恶唑衍生物9。通过丙烯酸乙酯与2-苯并恶唑酮(1a)的Michaël反应制备2-氧代-3(2 H)-苯并恶唑丙酸乙酯(10)。带10,在氨或烷基胺的存在下未观察到环状转化。
合成了一系列2-氧代-3(2 H)-苯并恶唑乙酸乙酯衍生物2。通过与氨,伯胺或肼反应,将这些化合物2分别转化为1-(2-羟苯基)-2,4-咪唑烷二酮衍生物4、5和6。这些新的乙内酰脲4,用三氯氧磷处理后,得到3 H -2-氧代咪唑并[2,1- b ]苯并恶唑衍生物9。通过丙烯酸乙酯与2-苯并恶唑酮(1a)的Michaël反应制备2-氧代-3(2 H)-苯并恶唑丙酸乙酯(10)。带10,在氨或烷基胺的存在下未观察到环状转化。
Process for the preparation of hydroxyphenyl hydantoin and of hydroxyphenyl glycine, and compounds thus obtained
申请人:BEECHAM GROUP PLC
公开号:EP0001319A1
公开(公告)日:1979-04-04
5-(a-Hydroxyphenyl) hydantoin of formula (I):
is prepared by reacting phenol, glyoxylic acid and urea in the presence of an acid catalyst in an aqueous medium.
The hydantoin may be hydrolysed to produce the amino acid,p-hydroxyphenylglycine, preferably to the D-amino acid, either by selective enzymatic hydrolysis and subsequent chemical hydrolysis, or by alkaline hydrolysis and subsequent resolution.
2-(2-Fluoro-4-halo-5-substituted phenyl) hydantoins, and their production and use
申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0070389A2
公开(公告)日:1983-01-26
A herbicidal composition which comprises as an active ingredient a compound of the formula:
wherein X is a chlorine atom or a bromine atom, Y is-CH2-, -S- or -SO2- and R is a C1-C4 alkyl group, an allyl group or a propargyl group, and an inert carrier.
一种除草组合物,其活性成分包括式中化合物:
其中 X 是氯原子或溴原子,Y 是-CH2-、-S- 或-SO2-,R 是 C1-C4 烷基、烯丙基或丙炔基,以及惰性载体。
MICRO-ORGANISMS, THEIR USE AND METHOD FOR PRODUCING D-AMINO ACIDS