申请人:The B. F. Goodrich Company
公开号:US04711957A1
公开(公告)日:1987-12-08
The disclosure deals with novel synthesis involving (a) hydrogenation of a cis-3,3-dialkyl-3,4-dihydroquinoxaline-2-one in the presence of a suitable hydrogenation catalyst, at elevated temperature and pressure, to yield a cis-3,3-dialkyl decahydroquinoxaline-2-one; (b) reaction of trans-1,2-diaminocyclohexane with acetone cyanohydrin in the presence of water to yield trans-3,3-dimethyl-decahydroquinoxaline-2-one; and (c) a reaction of 1,2-diamine with a saturated acyclic or cyclic monoketone or aldehyde and a holoform, in the presence of (i) a phase transfer catalyst (ii) an organic solvent, and (iii) solid or aqueous alkali to yield 2-keto-1,4-diazacycloalkanes. Such compounds exhibit exceptional UV light stabilizing property.
本公开涉及一种新型合成方法,包括以下步骤:(a)在适当的氢化催化剂存在下,以升高的温度和压力加氢cis-3,3-二烷基-3,4-二氢喹喔啉-2-酮,得到cis-3,3-二烷基-十氢喹喔啉-2-酮;(b)在水存在下,将trans-1,2-环己二胺与丙酮氰醇反应,得到trans-3,3-二甲基-十氢喹喔啉-2-酮;(c)在相转移催化剂(i)、有机溶剂(ii)和固体或水性碱(iii)存在下,将1,2-二胺与饱和的无环或环状单酮或醛和三氯甲烷一起反应,得到2-酮基-1,4-二氮杂环烷。这些化合物表现出非常出色的紫外光稳定性能。