3]dioxolane] (12; 35%). The ketal crystallizes in the forms of anhydrous 12a and the dihydrate 12b. The molecules in anhydrous 12a are linked to each other, forming N1–H1···N2–H2···N1* hydrogen-bond chiral helices of alternating chirality. In the dihydrate 12b, the ketal molecules are connected to a central string of water molecules by O3–H···O1 and O4–H···N1 hydrogen bonds, but not to themselves. Reaction
3,7-
二烯丙基-双
嘧啶-9-一(6)(bispidin-9-one = 3,7-二
氮杂双环[3.3.1] nonan-9-one)被转化为N-未取代的螺环[bispidin-9,2 ′-[1,3]二
氧戊环](12; 35%)。
缩酮以无
水12a和
二水合物12b的形式结晶。无
水12a中的分子相互连接,形成具有手性交替的N1-H1···N2-H2···N1 *氢键手性螺旋。在
二水合物12b中,
缩酮分子通过O3-H··O1和O4-H···N1氢键连接到
水分子的中心串,但不相互连接。的反应12用(
1,5-己二烯)
氯铂酸2得到几乎定量的螺[bispidin-9,2'-[1,3]二
氧戊环] PtCl 2(13)。裂解
缩酮以回收酮产生双生二醇(bispidin-9,9-diol)PtCl 2(14 ; 85%)。化合物14与Ag 2 cbdca(cbdca = 1,1-
环丁烷二
羧酸酯)反应生成
二水合物(bispidin-9