A Versatile Approach to 2-Substituted 3-Trifluoromethyl-1,3-diols Based on the Reaction of Trifluoroacetaldehyde Ethyl Hemiacetal with Enamines Derived from Aldehydes
Treatment of trifluoroacetaldehyde ethyl hemiacetal with various enamines, derived from various aldehydes, at room temperature, followed by hydrolysis with 10% HCl aqueous solution and reduction with sodium borohydride in ethanol, gave 2-substituted 3-trifluoromethyl-1,3-diols in good yields with fair to good diastereoselectivities.
A Direct, Concise, and Enantioselective Synthesis of 2-Substituted 4,4,4-Trifluorobutane-1,3-diols Based on the Organocatalytic In Situ Generation of Unstable Trifluoroacetaldehyde
A direct, concise, and enantioselective synthesis of 2‐substituted 4,4,4‐trifluorobutane‐1,3‐diols based on the organocatalytic asymmetricdirectaldol reaction of an ethyl hemiacetal of trifluoroacetaldehyde with various aldehydes was examined. A catalytic amount (30 mol %) of commercially available and inexpensive l‐prolinamide is quite effective as an organocatalyst for the catalytic in situ generation