Efficient one-step synthesis of trialkylsubstituted 2(5H)-furanones utilizing direct Ti-crossed aldol condensation and its application to the straightforward synthesis of (R)-mintlactone and (R)-menthofuranElectronic supplementary information (ESI) available: calculated structures of 7 and 8. See http://www.rsc.org/suppdata/cc/b2/b208077j/
The enantioselective hydrogenation of a variety of α-keto acetals to the corresponding α-hydroxy acetals with Pt catalysts modified with cinchonidine derivatives is described with ees up to 97% and high reaction rates, and the influence of the substrate structure, the modifier and the reaction conditions (catalyst, solvent, temperature, pressure, modifier concentration) was investigated in some detail.
Efficient one-step synthesis of trialkylsubstituted 2(5H)-furanones utilizing direct Ti-crossed aldol condensation and its application to the straightforward synthesis of (R)-mintlactone and (R)-menthofuranElectronic supplementary information (ESI) available: calculated structures of 7 and 8. See http://www.rsc.org/suppdata/cc/b2/b208077j/
TiCl4–Bu3N-mediated condensation of ketones with α,α-dimethoxyketones afforded trialkylsubstituted 2(5H)-furanones in a one-pot manner, wherein aldol addition and furanone formation occurred sequentially; its application to straightforward synthesis of (R)-mintlactone and (R)-menthofuran, two representative natural mint perfumes, is demonstrated.