Table 2.

Asymmetric cyclopropanation of iminium hexafluorophosphates 1 ^[a] and 2 ^[b] with diphenyldiazomethane 4.

	Iminium ion	R	5	Yield (%)[c]	er [d]
	1 a	H	5 a	69	67:33
	1 b	Me	5 b	60	65:35
	1 c	OMe	5 c	72	68:32
	1 d	NO2	5 d	58	69:31
	2 a	H	5 a	93	90:10
	2 b	Me	5 b	90	90:10
	2 c	OMe	5 c	95	93:7
	2 e	Cl	5 e	92	91:9
	2 f	F	5 f	88	90:10

[a] Conditions: 1 (0.20 mmol) and 4 (0.30 mmol) in dichloromethane (4 mL) at 20 °C. [b] Conditions: 2 (0.20 mmol) and 4 (0.30 mmol) in acetonitrile (4 mL) at −40 °C. [c] Yields of isolated products after purification by column chromatography. [d] Determined by chiral HPLC.