dibromides 27, 29, and 32 into the 7-azanorbornanes 42, 49, and 53. The diols 45 and 57 were obtained from 42 and 53via HBr elimination and stereoselective dihydroxylation; they proved weak inhibitors of several glycosidases. In no case could the formation of a bicyclic azetidine (6-azabicyclo[3.1.1]heptane) from the dibromides 26 and 30 be observed.
分子内
溴酰胺化和的二
溴化-环化Ñ -acylcyclohex -3-烯-1-胺4,8,9,11,13,14,和16中认为是双环胺的合成进行了研究作为构建基块和潜在的糖苷酶
抑制剂的兴趣。的trifluoroacetamides 4,9,和14与反应Ñ在AcOH
溴代琥珀
酰亚胺(
NBS),得到良好的产率二氢-1,3-恶嗪。烯烃8和9的二
溴化的立体选择性取决于保护基的性质,试剂和反应条件。Br 2 in CH 2 Cl 2将烯烃8和9主要转化为双轴反式,即反式-二
溴化物。的
溴化9与PhMe中3 NBR 3或被Br 2的Et的存在下4 NBR主要得到diequatorial反式,顺式- 27除了一些反式,反式- 28。所述的类似
溴化C(5) -取代Ñ酰基-4- aminocyclohexenes 11,13,14,和16与的PhMe 3NBr 3伴随着分子内副反应,该副反应被添加过量的Et 4 NB