1: With oxalyl dichloride in tetrahydrofuran; N,N-dimethyl-formamide T=0°C; 0.5 h; 2: With methanol in tetrahydrofuran; N,N-dimethyl-formamide T=20°C; 2 h;
参考文献
TAKEDA PHARMACEUTICAL COMPANY LIMITED
Patent: WO2006/36024 A1, 2006 ;
Location in patent: Page/Page column 141-142 ;
