作者:Mitsuru Oka、Kunihisa Baba、Hitoshi Hamajima、Ryoichi Unno、Yukiharu Matsumoto、Kensuke Nakamura、Lulu Dong
DOI:10.1002/jhet.5570400126
日期:2003.1
Molecular orbital calculations indicated that the cis-exo form is more stable than the trans form, in agreement with the experimental results. Furthermore, 6-cyano-1-azabicyclo[4.3.0]nonane (17) and 1-azabicy-clo[4.4.0]decane (19), both including a six-membered ring, were prepared from appropriate haloketones by using this double cyclization method.
由1,7-二氯-4-庚酮(4)在温和的条件下一步制备5-氰基-1-氮杂双环[3.3.0]辛烷(1)。该方法在制备5-氰基-4,6-二甲基-1-氮杂双-氯[3.3.0]辛烷(11)中的应用使两个非对映异构体处于平衡状态。11及其还原的化合物15的NMR测量表明,主要异构体为顺式-外型,次要异构体为反式。分子轨道计算表明,顺式-外型比反式更稳定,与实验结果一致。此外,6-氰基-1-氮杂双环[4.3.0]壬烷(通过使用这种双环化方法,由合适的卤代酮制备了包括六元环的17)和1-氮杂双-clo [4.4.0]癸烷(19)。