1.
Tetrahedron
; 68(29): 5738-5743, 2012 Jul 22.
Artículo
en Inglés
| MEDLINE
| ID: mdl-23162170
RESUMEN
An efficient and scalable synthesis of (-)-DAPD and (-)-APD has been developed. We discovered that t-butyl cyanoacetate can be used as a new additive for the sugar nucleoside base coupling step en route to DAPD with improved ß-selectivity and an isolated yield four fold greater than the original process scale method. Using this new process, (-)-DAPD has been prepared on greater than 20 g scale. In the synthesis of (-)-APD, a key enzyme-catalyzed hydrolysis reaction afforded the water-soluble deprotected α-anomer while leaving the ß-anomer completely untouched.