Ed. Edstrom et al., DEVELOPMENT OF METHYLTHIOMETHYL (MTM) PROTECTION FOR N-1 OF PYRROLO[2,3-D]PYRIMIDIN-2,4-DIONES, Tetrahedron letters, 37(6), 1996, pp. 759-762
This paper describes the application of the methylthiomethyl (MTM) pro
tecting group for the N-1 position in differentially protected pyrrolo
[2,3-d]pyrimidin-2,4-diones. By reaction of selected systems with SO2C
l2 at low temperature resulted in selective formation of N-1-chloromet
hyl derivatives. Subsequent heating in aqueous THF with silica gel aff
orded the deprotected compounds in good yield. Selectivity in the pres
ence of N-3 methoxymethyl (MOM) and benzyloxymethyl (BOM), and N-7 p-n
itrophenethyl protection was achieved.