Table 1. Ligand screen ^a .

Entry	Ligand	Yield of 3a b (%)	Yield of 5a b (%)	d.r. c	e.r. of 3a d	e.r. of 5a d
1	6a	31	31	50 : 50	83 : 17	58 : 42
2	6b	52	37	58 : 42	64 : 36	57 : 43
3	6c	52	41	56 : 44	92 : 8	88 : 12
4	6d	55	22	71 : 29	36 : 64	69 : 31
5	6e	71	24	75 : 25	30 : 70	83 : 17
6	6f	72	27	73 : 27	64 : 36	70 : 30
7	6g	57	43	57 : 43	30 : 70	80 : 20
8	6h	67	22	75 : 25	92 : 8	56 : 44
9	6i	92	7	93 : 7	>99 : 1	nd e
10	6j	51	34	60 : 40	96 : 4	65 : 35

^aReactions were performed under a N₂ atmosphere, see the ESI details.

^bYields of purified products.

^cd.r. was determined by 400 MHz ¹HNMR analysis of unpurified mixtures.

^de.r was determined by HPLC analysis of the corresponding diol after oxidation of the organoboron product with NaBO₃·4H₂O.

^eNot determined.