. 2016 Nov 2;72(50):8294–8308. doi: 10.1016/j.tet.2016.10.073

Table 1.

Cycloaddition of the nitrones 20a-20e and allyl alcohol.

Nitrone	Reaction time (h)^a^,^b	cis/trans ratio 21:22	Yield (%)
20a	24^a 2.5^b	64:36^a 69:31^b	21a – 47^c; 22a – 28^c 21a – 68^c; 22a – 25^c
20b	15^b	69:31	21b–44^c; 22b–21^c
20c	46^a 5^b	91:9 91:9	21c – 21^c; 21c + 22c – 21^d 21c – 26^c; 21c + 22c – 22^d
20d	7.5^b	74:26	21d–37^c; 21d + 22d–12^d; 22d–22^c
20e	5^b	83:17	21e – 21^c; 21e + 22e – 26^d

The cycloaddition reaction was conducted at 60 °C.

The cycloaddition reaction was conducted under MW irradiation.

Yield of the pure diastereoisomer.

Yield of a pure mixture of diastereoisomers.