Table 1. Screening of Catalytic Reactions^a.

entry	T (°C)	H2 pressure (bar)	conversion of 1a (%)b	yields of 2a/3a (%)b
1c	r.t.	10	23	19/22
2	r.t.	10	50	46/48
3d	r.t.	10	70	64/68
4e	r.t.	10	17	11/14
5f	r.t.	10	92	81/–
6	r.t.	40	58	52/56
7	135	20	>99	94(92)/96

^aConditions: 1a (0.5 mmol), catalyst Ru-1 (1.0 mol%), dioxane (1 mL), 36 h.

^bConversions/yields were determined by GC using benzyl benzoate as internal standard; isolated yields in parentheses.

^cToluene (1 mL) as solvent.

^d5 days.

^eHexSH (1 equiv) was added before the reaction.

^f3-Phenylpropionaldehyde (0.5 mmol) was used as substrate in the presence of HexSH (1 equiv); 4% ester was generated.