Table 5. Reaction outcomes from furyl and thiophenyl precursors 23–26 .

Entry	VCP	X	R1	Crude observations a (% conversion)	Product b (%)
					28/29		30/31
1	23	O	H	28a (>95), 30a (trace)	n.a. c
2	24	S	H	29a major, 31a minor, evidence of 24	29a (12)	31a (3) d
3	25	O	Me	28b (100)	28b (48)	30b (0)
4	26	S	Me	29b (100)	29b (55)	31b (0)

^a Percentage conversion determined by ¹H NMR after 1^st purification.

^b Isolated yield.

^c Compound decomposed during purification attempts (see ESI for further information).

^d 50% purity (determined by ¹H NMR) containing 29a.