The violation of Brewster's rule in (+)(1R,8R)-trans-bicyclo[6.1.0]nonane (3) has prompted us to reconfirm the absolute configuration by the following route: (−)(R)-trans-cyclooctene (5) → (+)(1S,8S)-trans-9,9-dibromobicyclo[6.10]-nonane (13)→ (+)(1R,8R)-3. This assignment establishes the stereospecific cis addition of diazomethane to the strained olefin (−)(R)-5 giving (−)(1R,8S)-trans-9,10-diaza-bicyclo[6
(+)(1 R,8 R)-反式-
双环[6.1.0]壬烷(3)中布鲁斯特规则的违反,促使我们通过以下路线重新确认绝对构型:(-)(R)-反式-环
辛烯(5)→(+)(1S,8S)-反式-9,9-二
溴双环[6.10]-
壬烷(13)→(+)(1 R,8 R)-3。这种分配建立了
重氮甲烷到应变烯烃(-)(R)-5的立体有择顺式加成,得到(-)(1 R,8 S)-反式-9,10-二氮杂-双环[6.3.0] -十一-9-烯(6),而不是(1小号,8小号) -顺式异构体(9)。向(-)- 5进行类似的立体定向1,3-偶极苯并
叠氮生成(+)(1 S,8 S)-反式-11-苯基-9,10,11-三
氮杂双环[6.3.0] undec-9-烯(22),其光解得到(+)(1 S,8 S)-反式-9-苯基氮杂
双环[6.1.0]壬烷(4)。立体
化学研究已经进行了双环Δ
吡唑啉的分解(进行6和顺式异构体9)至
环丙烷(3和顺式异构体10),或者Δ的2