CYCLOADDITION REACTION OF BENZOHETEROAZEPINE: SYNTHESIS OF 4a,5,6,12-TETRAHYDRO-1<i>H</i>-1,3-OXAZINO[3,2 -<i>d</i>[[1,5] BENZOTHIAZEPIN-1-ONES AND 1<i>H</i>,7<i>H</i>-1,3-OXAZINO[3,2-<i>d</i>][1,5] BENZODIAZEPIN-1-ONES
作者:Jiaxi Xu、Sheng Jin、Qiyi Xing
DOI:10.1080/10426509808033721
日期:1998.10.1
2,3-Dihydro-1,5-benzothiazepines and 2,3-dihydro-1H-1,5-benzodiazepines reacted with alpha -carbonylketenes, generated from 2-diazo-1,3-diphenyl-1,3-propanedione and 2-diazo-1-phenyl-1,3-butandione by heating, to give [2+4] cycloadducts 4a,5,6,12-tetrahydro-1H-1,3-oxazino[3,2-d] [1,5] -benzothiazepin-1-ones and 4a,5,6,12-tetrahydro-1H,7H-1,3-oxazino [3,2-d] [ 1,5]-benzodiazepin-1-ones. The cycloaddition reactions showed different regioselectivities when different 1,5-benzoheteroazepines reacted with asymmetric 2-diazo-1-phenyl-1,3-butandione. The conformations of cycloadducts and cycloaddition. reaction mechanism were described.