Zinc chloride-promoted stereoselective cyclocondensation of the Danishefsky diene [E-MeOCH:CHC(:CH2)OSiMe3] to ortho-substituted benzaldehyde and benzaldimine chromium tricarbonyl complexes gave 2,3-dihydro-4-pyridinone and 2,3-dihydro-4-pyranone derivs. in fairly good (75-90%) yields and with complete stereoselection. Exposure of CH2Cl2 solns. of the latter to sunlight gave the corresponding uncomplexed 2,3-dihydro-4-pyridinone and 2,3-dihydro-4-pyranone derivs.
Chiral tricarbonyl(h6-arene)chromium(0) complexes in stereoselective hetero Diels-Alder reactions
Baldoli Clara;
1996
Abstract
Zinc chloride-promoted stereoselective cyclocondensation of the Danishefsky diene [E-MeOCH:CHC(:CH2)OSiMe3] to ortho-substituted benzaldehyde and benzaldimine chromium tricarbonyl complexes gave 2,3-dihydro-4-pyridinone and 2,3-dihydro-4-pyranone derivs. in fairly good (75-90%) yields and with complete stereoselection. Exposure of CH2Cl2 solns. of the latter to sunlight gave the corresponding uncomplexed 2,3-dihydro-4-pyridinone and 2,3-dihydro-4-pyranone derivs.File in questo prodotto:
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