Table 1. Reaction optimisation and controls.

Entry	3 (mol%)	Substrate	i-Pr2NEt (equiv.)	10		11
				% a	er b	% a	er b
1	5	7	1.2	96	86 : 14	0	NA c
2	5	7	0	75	95 : 5	23	ND d
3	0	7	1.2	75	NA c	13	NA c
4	5	8	0	73	94 : 6	21	94 : 6
5	5	9	0	54	97 : 3	42	97 : 3
6	1	9	0	47	97 : 3	38	97 : 3
7	0	7, 8 or 9	0	0	NA c	0	NA c
8	0	7	0.1	63	NA c	15	NA c
9	0	8	0.1	45	NA c	21	NA c
10	0	9	0.1	17	NA c	7	NA c

^aDetermined by ¹H NMR spectroscopy using 1,3,5-trimethoxybenzene as internal standard.

^bDetermined by chiral HPLC analysis.

^cNA = not applicable.

^dND = not determined.