Table 1. The catalytic asymmetric cyclopropanation of styrene with FDA ^a .

Entry	Catalyst	R	Solvent	Temp. (°C)	Yield b (%)	(E) : (Z)	ee c (%)
1	[Rh2(OAc)4]	Et	DCM	60	0	—	—
2	[Co(TPP)]	Et	DCM	60	<10 d	—	—
3	[Co(P1)]	Et	DCM	60	46	84 : 16	—
4	[Co(P2)]	Et	DCM	60	81	80 : 20	81
5	[Co(P2)]	Et	EtOAc	60	81	80 : 20	81
6	[Co(P2)]	Et	PhCl	60	73	82 : 18	83
7	[Co(P2)]	Et	Hexanes	60	73	80 : 20	82
8	[Co(P2)]	Et	Toluene	60	86	85 : 15	86
9	[Co(P2)]	Et	Toluene	40	73	86 : 14	90
10	[Co(P2)]	Et	Toluene	RT	60	87 : 13	93
11	[Co(P2)]	t Bu	Toluene	40	78	95 : 5	96
12 e	[Co( P2 )]	t Bu	Toluene	40	84	95 : 5	96

^aCarried out in one-portion under N₂ with [olefin] = 0.20 M.

^bIsolated yields.

^cee of major (E)-diastereomer determined by chiral HPLC.

^dDetermined by ¹H-NMR.

^eWith 5 mol% of catalyst for 20 h.