Patent ID: 11912644
Assignee: CELGENE CORPORATION
Field: Organic fine chemistry (Chemistry)
Classification: CPC C  Y | IPC C

Claim 2:
3. The process of claim 1, wherein R7 is a hydroxyl protecting group selected from the group consisting of allyl, methyl, 2-methoxyethoxymethyl (MEM), methoxymethyl (MOM), methoxythiomethyl, t-butoxymethyl, tri-isopropylsilyloxymethyl (TOM), ethyl, 1-ethoxyehtyl, isopropyl, t-butyl, benzyl, trityl (Tr), dimethoxytrityl (DMT), monomethoxytrityl (MMT), p-methoxybenzyl (PMB), acetyl, chloroacetyl, trichloroacetyl, trifluoroacetyl, pivaloyl (Piv), benzoyl, p-phenylbenzoyl, trimethylsilyl (TMS), triisopropylsilyl (TIPS), t-butyldimethylsilyl (TBDMS), and tetrahydropyranyl.