Citation:
XIANG Ji-Ming, FENG Xiao-Jin, LI Bao-Lin. Synthesis and Asymmetric Henry Reaction of Menthyl Phenylglyoxylate[J]. Chinese Journal of Applied Chemistry,
;2009, 26(7): 857-859.
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In the presence of titanium(Ⅳ) ethoxide,chiral menthyl phenylglyoxylate was prepared via transesterification of ethyl phenylglyoxylate and the abundant natural chiral menthol,and the yield of the transesterification was 68%.In the auxiliaries of asymmetric factor,the menthyl R-2-hydroxy-2-phenyl-3-nitropropionate was synthesized by the Henry reaction with menthyl phenylglyoxylate and nitromethane,and the yield was 86%.Their structures were confirmed by IR,1H NMR,13C NMR spectroscopy and elemental analysis.The enantioselectivity was analyzed by HPLC,and the enantiomeric excess(e.e) was 52.8%.
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