New Spirans Containing a 1,5-Benzodithiepine System, Derived from Methylbenzenes. Conformational Transmission
摘要:
[GRAPHICS]A synthesis of three new spirans, derived from methylbenzenes, containing the 1,5-benzodithiepine system is reported. X-ray structure proved the identity of model monospiran 9. In the solid and liquid state, the conformation of the seven membered ring is chair, and the five-membered ring has the envelope conformation. The effect of conformational transmission in spirans 9 and 10 was observed, The synthesis of trispirans from hexamethylbenzene using the proposed scheme is also possible.
Diversity-oriented approach to novel spirocycles via 1,2,4,5-tetrakis(bromomethyl)benzene under operationally simple reaction conditions
作者:Sambasivarao Kotha、Rashid Ali
DOI:10.1016/j.tet.2015.07.008
日期:2015.9
4,5-tetrakis(bromomethyl)benzene in one step. We have also expanded this strategy to generate a variety of bis-spirocycles by treating the di-bromo intermediates with different AMCs under operationally simple reaction conditions.