R	R1	R2	R3	R4
1	H	OMe	H	H	OMs
2	H	OMe	H	H	N3
3	H	OMe	Bn	H	N3
4	H	OMe	H	Bn	N3
5	H	OAc	Bn	Ac	N3
6	OAc	H	Bn	Ac	N3
7	H	OAc	Ac	Bn	N3
8	H	SEt	Bn	Ac	N3
9	SEt	H	Bn	Ac	N3
10	H	SEt	Ac	Bn	N3
11	H		Bn	Ac	N3
12	H		Bn	H	N3