The reaction of tert-butylalkynyl chromium Fischercarbenecomplex 1 with nitrones 2 affords β-enamino-ketoaldehydes 4 by the light-promoted rearrangement of the corresponding [3+2] cycloadduct carbenecomplexes3. On the other hand, [3+2] cycloaddition of chiral nonracemic Fischeralkenylcarbenecomplexes 19 with nitrilimines 10 yields enantiomerically pure Δ2-pyrazolines with high regio- and diastereoselectivity
First highly regio- and diastereoselective synthesis of Δ2-pyrazolines by [3+2] cycloaddition of chiral non-racemic Fischer carbene complexes with nitrilimines
作者:José Barluenga、Félix Fernández-Marí、Enrique Aguilar、Argimiro L Viado、Bernardo Olano
DOI:10.1016/s0040-4039(98)00886-7
日期:1998.7
[3+2] Cycloaddition of Fischer carbene complexes with nitrilimines is described for the first time. The “one-pot” conversion of Fischer carbenes into enantiomerically pure Δ2-pyrazolines with high regio- and diastereoselectivity is presented as an expeditious route to these compounds.