Table 1 Optimizations of reaction conditions^a.

^aReactions were performed with 1a (0.15 mmol), 2a (0.1 mmol), cat (0.01 mmol), 3 Å MS (100 mg), solvents (0.5 mL) at ambient temperature for 24 h.
^bYields and dr value were determined by crude ¹H NMR analysis using 1,2-dimethoxyethane (DME, 0.1 mmol) as internal standard.
^cee values were determined by HPLC analysis on a chiral stationary phase. PMP = para-methoxylphenyl, Ar = 3,5-dimethoxyphenyl.

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