Table 1.

Preparation of pyrazoles 55 from β-aminoenones 49a, 49b and 49c.

Starting Compound	R	R1	Yields of 51 (%)
50a	(CH2)2Ph	Me	81
	(CH2)2Ph	t-Bu	78
50b	iPr	Me	84
	iPr	t-Bu	86
50c	t-Bu	Me	72
	t-Bu	t-Bu	86