Process for preparing enantiomerically pure fluorinated...

Details Process for preparing enantiomerically pure fluorinated... Process for preparing enantiomerically pure fluorinated...

C - Chemistry, Metallurgy

07

D

C07D 493/04 (2006.01) B01J 31/18 (2006.01) C07D 211/76 (2006.01) C07D 303/08 (2006.01) C07D 401/04 (2006.01) C07D 405/04 (2006.01) C07D 491/044 (2006.01)

Patent

CA 2130481

2130481 9317026 PCTABS00025 A process for preparing compounds of formula (B) wherein: one of A1' or A2' represents hydrogen and the other represents a group CF3-Y- wherein Y represents -CF2-, > C=O, or -CH(OH)-, or A1' and A2' are groups convertible to A1 and A2 respectively. Y1 represents -O-, -CH2- or NRO wherein RO is hydrogen, alkyl or alkylcarbonyl; R1 and R2 independently represent hydrogen or alkyl; or R1 and R2 together represent a C2-7 polymethylene moiety; R3 represents hydrogen, hydroxy, alkoxy or acyloxy and R4 is hydrogen or R3 and R4 together represent a bond; which process comprises reacting a compound of formula (C): wherein the variable A1', A2', Y1, R1 and R2 are as defined above, in the presence of an oxygen source and a chiral catalyst as defined in WO/91/14694.

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