Table 1.

Diastereoselective Oxidative Coupling of 8

entry	V-cat 18	additivea	solventb	yield (%)c	dr
1	20 mol %	–	chlorobenzened	34 (44)	79:21
2	20 mol %	LiCl	toluene	52 (59)	92:8
3	40 mol %	LiCl	toluene	49 (52)	93:7
4	20 mol %	LiCl	chlorobenzene	54 (60)	90:10
5	20 mol %	HOAc	toluene	49 (55)	87:13
6	20 mol %	HOAc	chlorobenzene	49 (64)	90:10
7	20 mol %	HOAc	chlorobenzened	58 (67)	94:6

^a20 mol %

^b0.3 M

^cIsolated yield based on recovery of substrate in parentheses

^d0.5 M