Chiral phosphoric acid catalyzed enantioselective transfer hydrogenation of ortho-hydroxybenzophenone N-H ketimines and applications
Unprotected synthesis: The first enantioselective chiral phosphoric acid catalyzed transfer hydrogenation of unprotected ortho-hydroxybenzophenone N-H imines by using a Hantzsch ester as the hydrogen source afforded the corresponding chiral N,O-unprotected ortho-hydroxydiarylmethylamines in high yields with excellent enantioselectivities (see scheme).
Nguyen, Thanh Binh,Wang, Qian,Gueritte, Franioise
supporting information; experimental part
p. 9576 - 9580
(2011/10/02)
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