Patent ID: 11878989
Assignee: SHANGHAI FOREFRONT PHARMA CO., LTD.
Field: Organic fine chemistry (Chemistry)
Classification: CPC C  Y | IPC C

Claim 2:
3. The method for preparing the L-erythro biopterin compound according to claim 2, wherein the leaving group is selected from: silicyl group, halogen, OSOnR9, OCOR10 or OPO2R11; in which R9, R10 or R11 is independently selected from: —CF3, alkyl, phenyl, or alkyl substituted phenyl, n is 0, 1 or 2; and/or
the amino protecting group is selected from: -Boc, -Cbz, —Ac, -Ts, -Ms, -Bz, -Bn, -PMB, or schiff base.