Table 4.

A regioselective 1,3-hydrogen shift.^a

entry	allenamides		conditions (time)	amido-alkenes		yield [%]b,c
1		29a: R = Ph	115 °C (16 h)		33a	71
2		29b: R = H	—d		33b	90
3		30	115 °C (16 h)		34	79
4		31a: R = H	CSA (10 min)		35a	68
5		31b: R = Me	CSA (10 min)		35b	80
6		32	CSA (10 min)		36	84

^aUnless otherwise noted, CH₃CN was the solvent for thermal conditions and CH₂Cl₂ was the solvent when using 10 mol % of CSA at rt. For all reactions, concn = 0.10 M. ^bAll were isolated yields. ^cAll amido-di- and trienes were exclusively E-selective [≥95:5]. ^dSee text for this isomerization.