The reaction of amino ketones with titanium tetrachloride/zinc powder  has been studied in tetrahydrofuran and 1,4-dioxane under an argon  atmosphere. Symmetrical 1,8-diaminoalkenes 2 were obtained from the  corresponding Mannich base hydrochlorides 1 via the intermolecular  reductive coupling, and azacycloalkenes 4 were prepared from  diketoamines 3 via the intramolecular reductive coupling under similar  conditions.
                                    研究了
氨基酮与
四氯化钛/
锌粉在
四氢呋喃和1,4-
二恶烷中、
氩气氛下的反应。由相应的曼尼希碱盐酸盐1通过分子间还原偶联得到对称1,8-二
氨基烯烃2,由
二酮胺3通过分子内还原偶联在相似条件下得到氮杂环烯烃4。