Titanium(III)-Induced Transformation of Hydroxylamines to Imines or Secondary Amines
作者:Yoichi Kodera,、Shoji Watanabe、Yasushi Imada、Shun-Ichi Murahashi
DOI:10.1246/bcsj.67.2542
日期:1994.9
converted into the corresponding secondary amines upon treatment with aqueous titanium trichloride in methanol. It is noteworthy that optically active hydroxylamines, which have chirality at the α-position to nitrogen, can be converted into optically active secondary amines without loss of chirality. Dihydro-2(1H)-quinolinones can be prepared upon treatment of 1-hydroxy-3,4-dihydro-2(1H)-quinolinones with
在室温下用无水三氯化钛在 THF 中处理后,N,N-二取代和环状羟胺可以有效地转化为相应的亚胺。用无水三氯化钛对 N-烯丙基羟胺进行类似处理得到 1-氮杂二烯,它是氮杂-狄尔斯-阿尔德反应的通用合成中间体。另一方面,在用甲醇中的三氯化钛水溶液处理后,相同的羟胺可以转化为相应的仲胺。值得注意的是,在氮的 α 位具有手性的旋光羟胺可以转化为旋光仲胺而不会失去手性。二氢-2(1H)-喹啉酮可以通过用三氯化钛水溶液处理 1-羟基-3,4-二氢-2(1H)-喹啉酮来制备。N,N-二取代和环状羟胺的底物可以通过用亲核试剂处理硝酮而容易地制备。由于硝酮可以通过金属催化制...