An Aza Cyclopropylcarbinyl-Homoallyl Radical Rearrangement–Radical Cyclization Cascade. Synthesis of Dibenzoimidazoazepine and Oxazepine Derivatives
作者:Alexander F. Khlebnikov、Mikhail S. Novikov、Petr P. Petrovskii、Helen Stoeckli-Evans
DOI:10.1021/jo200788k
日期:2011.7.1
at the DFT B3LYP/6-31G(d) level. Heating adducts, (2aRS,13SR,13aRS)-13,13a-diaryl-13,13a-dihydro-1H,2aH-azireno[1′,2′:3,4]imidazo[1,2-d]dibenzo[b,f][1,4]oxazepines and (2aRS,13SR,13aRS)-13,13a- diphenyl-2a,7,13,13a-tetrahydro-1H-azireno[1′,2′:3,4]imidazo[1,2-a]dibenzo[c,f]azepine, with an excess of AIBN in toluene gave new polyheterocyclic systems via a novel aza cyclopropylcarbinyl-homoallyl radical
通过加热反式-1-芳基-7,11b-二氢-1 H-叠氮基[1,2- a ]二苯并[ c,f ]氮杂环庚烷将二苯并恶唑啉鎓W-化物环化成C═N双键3-芳基- 2的键ħ -azirines前进远藤-stereoselectively给予在约区域异构cycloadducts 1:1的比例,总收率良好。与二苯并a庚因鎓叶立德相反,二苯并ze庚因鎓W-内酯的环加成反应是区域选择性的,但没有内-外-立体选择性。理论上在DFT B3LYP / 6-31G(d)水平上研究了这种环加成反应选择性的原因。加热加合物,(2a RS,13 SR,13a RS)-13,13a-二芳基-13,13a-二氢-1 H,2a H-叠氮基[1',2':3,4]咪唑[1,2- d ]二苯并[ b,f ] [1,4]氮杂ze庚烷和(2a RS,13 SR,13a RS)-13,13a-二苯基-2a,7,13,13a-四氢-1 H-叠氮基[1',2':3