Patent ID: 9340508
Filing Date: 2016-05-17
CPC Classification: C07C,C07D,Y02P

Claim Text:
1. A compound of formula (XI) or (XIa): wherein R′ is hydrogen and R is selected from benzyl, acetyl, benzoyl, trifluoromethanesulfonyl, benzenesulfonyl, p-toluenesulfonyl, methoxycarbonyl, ethoxycarbonyl, tert-butoxycarbonyl, allyloxycarbonyl and benzyloxycarbonyl optionally substituted on the aromatic ring with up to three substituents selected from halogen, cyano and trifluoromethyl; or R′ is trimethylsilyl and R is tert-butoxycarbonyl; or R and R′ taken together with the nitrogen atom they are linked to form a phthalimido group.