Table 1 Optimization of reaction conditions^a


Entry	Variations of reaction conditions	Product	Yield (%)^b
1	No HER catalyst	3a’	21
2	cat 5 as HER catalyst	3a	30
3	cat 1 as HER catalyst	3a	50
4	cat 2 as HER catalyst	3a	81
5	cat 3 as HER catalyst	3a	68
6	cat 4 as HER catalyst	3a	71
7	No electricity^c	-	-
8	cat 2 as HER catalyst, zinc plate as anode	3a	52

GF graphite felt, CCE constant current electrolysis, DMFN,N-dimethylformamide.
^aReaction conditions: 1a (1.5 mmol), 2a (0.5 mmol), HER catalysts (5 mol%), ⁿBu₄NClO₄ (1.0 mmol), DMF (10 mL), graphite felt anode, nickel plate cathode, undivided cell, CCE = 18 mA, 3 h (4.03 F/mol), 0 °C.
^bIsolated yield, reaction diastereoselectivity (dr) >15/1, E/Z > 20/1;
^c48 h.

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