Table 1.

Optimization Studies^a

Entry	Phosphate	Yield (%)	er
1	P1	54	55:45
2	P2	30	52:48
3	P3	96	35:65
4	P4	62	86:14
5	P5	97	93:7
6	P6	98	87:13
7	P7	85	95:5
Entry	Change from Entry 7	Yield (%)	er
8	room temperature	93	89:11
9	thiophrenol H-atom donor	81	94:6
10	10 mol% P7	89	95:5
11	no base	<1	-
12	no thiol	<5	-
13	no photocatalyst	<1	-
14	no light	<1	-

^aReactions were conducted on a 0.05 mmol scale, and yields determined by NMR analysis relative to an internal standard. Enantioselectivity was determined by HPLC analysis on a chiral stationary phase.