Synthesis of Glycaro-1,5-lactams and Tetrahydrotetrazolopyridine-5-carboxylates: Inhibitors ofβ-D-Glucuronidase andα-L-Iduronidase
作者:Jagadish Pabba、Brian P. Rempel、Stephen G. Withers、Andrea Vasella
DOI:10.1002/hlca.200690066
日期:2006.4
The known glucaro-1,5-lactam 8, its diastereoisomers 9–11, and the tetrahydrotetrazolopyridine-5-carboxylates 12–14 were synthesised as potential inhibitors of β-D-glucuronidases and α-L-iduronidases. The known 2,3-di-O-benzyl-4,6-O-benzylidene-D-galactose (16) was transformed into the D-galactaro- and L-altraro-1,5-lactams 9 and 11via the galactono-1,5-lactam 21 in twelve steps and in an overall yield
已知的葡糖二酸-1,5-内酰胺8,非对映体及其9 - 11,和tetrahydrotetrazolopyridine -5-羧酸盐12 - 14合成为的潜在抑制剂的β -D-葡糖醛酸和α -L-iduronidases。已知2,3-二ø -苄基-4,6- ø -亚苄基- d -半乳糖(16)转化到d-galactaro-和L-altraro -1,5-内酰胺9和11通过在半乳糖-1,5-内酰胺21分十二步进行,总收率分别为13%和2%。从已知的酒石酸酐41开始的不同策略导致了D-葡萄糖醛-1,5-内酰胺8,D-半乳糖醛-1,5-内酰胺9,L-idaro-1,5-内酰胺10和L -altraro-1,5-lactam 11分十步,总收率为4-20%。酸酐41被转化为L-苏糖酸酯46。将46烯烃烯烃化为(E)-或(Z)-烯烃47或48然后进行试剂或底物控制的二羟基化,内酯化,叠氮化,还原和脱保护反应,形成内酰胺8