. 2023 Feb 3;25(6):987–991. doi: 10.1021/acs.orglett.3c00074

Table 1. Yields of Isolated Piperazines 2.

Entry	X	R¹	R²	Product	Yield (%)
1	Br	H	COMe	2a	80
2	Br	H	CO₂^tBu	2b	55
3	Br	H	F	2c	30
4	Br	H	CF₃	2d	34
5	Br	H	CN	2e	70
6	Br	H	Cl	2f	25
7	I	H	H	2g	30
8	I	H	F	2c	55
9	I	H	Cl	2f	58
10	I	H	Cl	2f	48^a
11	I	OMe	H	2h	42
12	I	H	Me	2i	35

Using 4CzIPn as photocatalyst.