Polystyryl supported-TBD (PSTBD) is an efficient and reusable heterogeneous basic catalyst under solvent-free conditions for a variety of organic transformations such as 1,2-epoxide ring-opening, aldol-type condensation and Michael addition.
Polystyrene-supported 1,5,7-triazabicyclo[4.4.0]dec-5-ene (PS-TBD) is an effective basic catalyst for the thiolysis of the 1,2-epoxides 1a-e by the aryl-and alkyl-substituted thiols 2A-E under solvent-free conditions while its activity is remarkably reduced in MeCN. The reactions are totally antidiastereoselective and generally highly C-β regioselective.
Addition reactions O 0060Polystyryl-Supported TBD as an Efficient and Reusable Catalyst under Solvent-Free Conditions. -Polystyryl supported-TBD is used as basic catalyst for a variety of organic transformations such as 1,2-epoxide ring-opening, aldol-type condensation and Michael addition. -(FRINGUELLI*, F.; PIZZO, F.; VITTORIANI, C.; VACCARO, L.; Chem.
Thioethers Q 0580Polystyrene-Supported 1,5,7-Triazabicyclo[4.4.0]dec-5-ene as an Efficient and Reusable Catalyst for the Thiolysis of 1,2-Epoxides under Solvent-Free Conditions. -The reaction proceeds with high to excellent β-selectivity except for thiol (IIa). The inverse selectivity in this case is explained by hydrogen bonding. Exclusive anti-selectivity is observed in the thiolysis of 1,2-disubstituted oxiranes. The organocatalyst can be easily recovered and reused. After 5 consecutive cycles reactivation by treatment with an ammonia solution is required. -(FRINGUELLI*, F.; PIZZO, F.; VITTORIANI, C.; VACCARO, L.; Eur.
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