Summary of reaction conditions attempted during optimization of the final step to synthesize 3.

No.	Reaction conditions	Yield
1	KI (3 eq.), PR3 (3 eq.) and precursor (1 eq.), reflux (3 days)	87%
2	a. Reflux KI (3 eq.) and precursor (1 eq.) for 1 h	84%
	b. Add PR3 (3 eq.), reflux (4 days)
3	a. KI (3 eq.) and precursor (1 eq.), MW at 160 °C for 1 min	98%
	b. Add PR3 (3 eq.), MW at 160 °C (1 h)