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- W2804994433 abstract "Abstract An efficient asymmetric Michael/cyclization cascade reaction of 4-chromanones with isothiocyanato oxindoles has been revealed. Under bifunctional organocatalysis by rosin-based squaramide catalyst, a series of spiro[oxindole/thiobutyrolactam/chromanone] complexes were conveniently constructed in a highly stereoselective manner (up to 99% yields, > 20:1 dr and >99% ee). The reaction leads to the formation of three contiguous stereogenic centers and two spiro quaternary stereocenters." @default.
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- W2804994433 date "2018-07-01" @default.
- W2804994433 modified "2023-10-15" @default.
- W2804994433 title "Highly efficient construction of chiral dispirocyclic oxindole/thiobutyrolactam/chromanone complexes through Michael/cyclization cascade reactions with a rosin-based squaramide catalyst" @default.
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- W2804994433 doi "https://doi.org/10.1016/j.tet.2018.05.052" @default.
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