A new method was developed for the synthesis of 6-substituted 1,5-diazabicyclo[3.1.0]hexanes and 7-substituted 1,6-diazabicyclo[4.1.0]heptanes by condensation of N-monohalotrimethylene- and N-monohalotetramethylenediamines with carbonyl compounds in the presence of bases. X-ray diffraction studies and quantum-chemical B3LYP/6-31G* calculations demonstrated that the conformations of the resulting bicyclic systems are stabilized by stereoelectronic interactions. As a result, a boat conformation prevails in 1,5-diazabicyclo[3. 1.0]hexanes, whereas the energies of chair, half-chair, and boat conformations of 1,6-diazabicyclo[4.1.0]heptanes are equalized.
enantioselective 1,3-dipolarcycloaddition of meso-diaziridines with chalcones was realized by utilizing the ScIII-N,N'-dioxide complex as the catalyst. In this transformation, the 1,3-dipole intermediates generated from the C-N bond cleavage of diaziridine were trapped by chiral N,N'-dioxide/scandium(III) complex activated chalcones to undergo enantioselective 1,3-dipolarcycloaddition. A range of chiral
(3+3)-Annulation of Donor-Acceptor Cyclopropanes with Diaziridines
作者:Alexey O. Chagarovskiy、Vladimir S. Vasin、Vladimir V. Kuznetsov、Olga A. Ivanova、Victor B. Rybakov、Alexey N. Shumsky、Nina N. Makhova、Igor V. Trushkov
DOI:10.1002/anie.201805258
日期:2018.8.6
The first example of (3+3)‐annulation of two different three‐membered rings is reported herein. Donor‐acceptor cyclopropanes in reaction with diaziridines were found to afford perhydropyridazine derivatives in high yields and diastereoselectivity under mild Lewis acid catalysis. The disclosed reaction is applicable for the broad substrate scope and exhibits an excellent functional group tolerance.
Iron-catalyzed stereospecific [3+3]-annulation of aziridines with diaziridines is described to furnish [1,2,4]-triazines in high yield at room temperature. The use of an inexpensive iron salt catalyst, substrate scope and enantiomeric purity are the important practical features.
thermolysis conditions presumably occurs via the initially formed unstable dipolar bicyclic intermediates 4. Isomerization of these intermediates and subsequent addition of the second molecule of diphenylcyclopropenone with the extrusion of one molecule of carbon monoxide results in the formation of tricyclic 4a,7b-diazacyclopenta[cd]inden-7-ones 8 in good yields.
在热解条件下,由6-芳基-1,5-二氮杂双环[3.1.0]己烷1生成的偶氮甲亚胺与二甲环亚胺形成的二倍过量的二苯基环丙烯酮的正式[2 + 3]环加成反应可能是通过最初形成的不稳定的偶极双环中间体4发生的。这些中间体的异构化以及随后的第二分子二苯基环丙烯酮的加入以及一分子一氧化碳的挤出导致以良好的产率形成三环的4a,7b-二氮杂环戊[ cd ]茚满7-酮8。
Thermally Induced Tandem Cycloaddition of 2-Alkyl-3-phenylcyclopropenones to 6-Aryl-1,5-diazabicyclo[3.1.0]hexanes
作者:A. P. Molchanov、D. I. Sipkin、Yu. B. Koptelov、R. R. Kostikov
DOI:10.1007/s11178-005-0205-z
日期:2005.4
Thermolysis of 6-aryl-1,5-diazabicyclo[3.1.0]hexanes in the presence of 2-alkyl-3-phenylcyclopropenones gives fused polycyclic systems of the 4a,7b-diazacyclopenta[cd]inden-7-one series as a result of addition of two cyclopropenone molecules and extrusion of CO molecule. The first step of the process is characterized by 100% regioselectivity, leading to the adduct with vicinal arrangement of the aryl groups, while the regioselectivity of the second step is likely to be determined by spatial interactions between substituents in the cyclopropenone molecule and trimethylene bridge of the diazabicyclohexane. Steric hindrances in the second step could eliminate formation of stable products.
6- 芳基-1,5-二氮杂双环[3.1.0]己烷在 2-烷基-3-苯基环丙烯酮存在下发生热解,产生 4a,7b-二氮杂环戊并[cd]茚-7-酮系列的融合多环体系,这是两个环丙烯酮分子相加和 CO 分子挤出的结果。该过程第一步的特点是具有 100% 的区域选择性,可产生芳基邻接排列的加合物,而第二步的区域选择性可能取决于环丙烯酮分子中的取代基和二氮杂双环己烷的三亚甲基桥之间的空间相互作用。第二步中的立体阻碍可能会导致无法形成稳定的产物。