Thermal [2+2] Cycloaddition of Allenynes: Easy Construction of Bicyclo[6.2.0]deca-1,8-dienes, Bicyclo[5.2.0]nona-1,7-dienes, and Bicyclo[4.2.0]octa-1,6-dienes
作者:Chisato Mukai、Yasuyuki Hara、Yusuke Miyashita、Fuyuhiko Inagaki
DOI:10.1021/jo070513p
日期:2007.6.1
the allenyl group, in xylene (or mesitylene) without microwave irradiation resulted in the efficient formation of bicyclo[5.2.0]nona-1,7-dienes and bicyclo[4.2.0]octa-1,6-dienes in high yields. This method was shown to be successfully applicable to the first construction of bicyclo[6.2.0]deca-1,8-dienes. Construction of the corresponding oxa- and azabicyclo[m.2.0] frameworks could also be attained.
在不进行微波辐射的情况下,在二甲苯(或均三甲苯)中,烯丙基上具有苯磺酰基官能团的烯丙炔的简单回流,可以有效地形成双环[5.2.0] nona-1,7-二烯和双环[4.2.0]。高产量的octa-1,6-二烯。已证明该方法成功地适用于双环[6.2.0] deca-1,8-二烯的第一个构建。的相应的氧杂建设和氮杂二环[米.2.0]也可以实现框架。该热闭环反应涉及正式的[2 + 2]环加成,其中无论烯丙基部分上的苯磺酰基官能团的位置如何,烯基部分的远侧双键仅充当π-组分之一。