derivative (−)-5d. Also the N-methyl- and N-acryloylfenchane-8,2-sultams (−)-5b,c were prepared, and both the reactivity and diastereoselectivity imparted by the new chiral auxiliary to N,N′-fumaroylbis[fenchane-8,2-sultam] (−)-5e were compared with those of (−)-1a by addition of cyclopenta-1,3-diene to (−)-5e, in various solvents and at different temperatures under TiCl4-mediated and uncatalyzed conditions
将现在校正的(2 R)-
硼烷-10,2-sultam((-)- 1a)的X射线结构及其已发表的N-
巴豆酰基衍
生物(-)- 1d的X射线结构与这些结构进行了比较新合成的(2 R)-fenchane-8,2-sultam((+)- 5a)及其N-
巴豆酰基衍
生物(-)- 5d的合成。还制备了N-甲基-和N-
丙烯酰胺基
戊烷-8,2-sultams(-)- 5b,c,并且新的手性助剂赋予了N,N反应性和非对映选择性。通过在不同溶剂中和在不同溶剂中向(-)- 5e中添加
环戊-1,3-二烯环戊-1,3-二烯,将'-富马酰基双[fenchane-8,2-sultam](-)- 5e与(-)- 1a进行了比较TiCl 4介导和未催化条件下的温度。这些因素的影响来确定通过的损失合理化蒙面Ç 2由热力学不太稳定的溶剂对称性较早归因于
樟脑衍生的磺内酰胺以及过渡态稳定偶极顺- S-顺式构象异构体。