Unexpected regioselectivities of [3 + 2] cycloaddition of azomethine imines to acrylonitrile and 4-nitrophenyl vinyl sulfone
作者:Mikhail I. Pleshchev、Vadim V. Kachala、Alexander S. Goloveshkin、Ivan S. Bushmarinov、Vladimir V. Kuznetsov、Dmitriy V. Khakimov、Nina N. Makhova
DOI:10.1016/j.mencom.2013.09.011
日期:2013.9
The [3 + 2] cycloaddition of azomethine imines derived from 6-aryl-1,5-diazabicyclo[3.1.0]hexanes to acrylonitrile and 4-nitrophenyl vinyl sulfone proceeds with high diastereoselectivity, but with opposite regioselectivity, which has been clarified by quantum chemical calculations.
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
CAN-mediated new, regioselective one-pot access to bicyclic cationic structures with 2,3-dihydro-1H-pyrazolo[1,2-a]pyrazol-4-ium core
作者:Mikhail I. Pleshchev、Nikita V. Das Gupta、Vladimir V. Kuznetsov、Ivan V. Fedyanin、Vadim V. Kachala、Nina N. Makhova
DOI:10.1016/j.tet.2015.09.033
日期:2015.11
[3+2]-cycloaddition of (2-bromo-2-nitrovinyl)arenes to N,N-cyclic azomethine imines, generated in situ by diaziridine ringopening in 6-Ar-1,5-diazabicyclo[3.1.0]hexanes or by metathesis of initially formed azomethine imine, followed by one-pot aromatization of the formed pyrazolidine ring.