Catalytic asymmetric formal [3+2] cycloaddition of isatogens with azlactones to construct indolin-3-one derivatives
The chiral amide-guanidine-catalyzed asymmetric formal [3+2] cycloaddition of isatogens with azlactones is presented. This strategy provided a facile and feasible route to chiral indolin-3-one derivatives bearing two contiguous tetrasubstituted stereocent
Fine regioselective tuning in the oxidation of sec,sec 1,2-diols by dimethyldioxirane
Non-symmetric sec,sec 1,2-diols and their o-isopropylidene derivatives undergo a regioselective oxidation by dimethyldioxirane depending on the electronic effects of the substituents. These results support previous views about the concerted O-insertion mechanism via a polar transition state.
Bovicelli, Paolo,Sanetti, Anna,Lupattelli, Paolo
p. 10969 - 10978
(2007/10/03)
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