131 13 129 74 128 88 128 52 128 39 128 31 128 18 126 51 56 73 ch 52 01 ch 3 32 36 d j 3 6 hz ch 2 10 41 ch 3 the experimental procedure of this entry was the same as that illustrated in entry 1 except that the imines 8l was used in this entry as a reactant and the reaction time of this entry was 120 hours to yield the adduct 9l 1 h nmr 400 mhz cdcl 3 u03b4 7 92 7 84 m 4h 7 47 7 35 m 6h 7 29 7 25 m 2h 7 18 7 15 m 1h 7 11 7 09 m 2h 6 06 s 1h 3 66 3 58 m 1h 3 10 3 06 m 1h 1 82 1 73 m 1h 1 77 s 3h 1 70 1 61 m 1h 0 87 t j 7 6 hz 3h 13 c nmr 100 mhz cdcl 3 u03b4 137 91 137 87 137 47 133 75 132 93 132 57 132 47 131 74 131 64 128 78 128 42 128 30 128 23 128 10 127 87 127 03 126 21 60 66 ch 28 91 d j 5 1 hz ch 2 12 89 ch 3 10 55 ch 3 to a 10 ml round bottomed flask were added imine 81 0 34 mmol and amino alcohol 7 0 0766 g 0 34 mmol in toluene 3 ml followed by the addition of a diethylzinc solution 1 0 m in n hexane 1 7 ml 1 7 mmol under ice bath condition the reaction solution.