Reaction of the cyclic vinyl phosphordiamidate 2h with phenyllithium and phenylmagnesium chloride.

Entry	M	Temp. [°C]	5aa [%]	6a [%]
1	MgCl	−78 to 23	36	33
2	MgCl	−40	24	8
3	MgClb	0 to 23	25	45
4	Li	−78 to 23	67	0

^aIsolated yield.

^b10 mol% of CuI was used as a catalyst.