Synthesis of carbasugars from aldonolactones. Part II. Preparation of polyhydroxy/aminocyclopentanes functionalised at all five ring carbons
作者:Steen K. Johansen、Inge Lundt
DOI:10.1039/a907008g
日期:——
Starting from (1R,5R,8R)-8-acetoxy-2-oxabicyclo[3.3.0]oct-6-en-3-one 4 the syntheses of 5-deoxy-4a(R)-hydroxy-4a-carba-α-D-ribo-hexofuranose 17, 5-deoxy-4a(R)-hydroxy-4a-carba-α-D-lyxo-hexofuranose 21, 5-deoxy-4a(R)-hydroxy-4a-carba-α-D-xylo-hexofuranose 23 and 4a(R)-hydroxy-2-amino-2,5-dideoxy-4a(R)-hydroxy-4a-carba-α-D-arabino-hexofuranose 1 have been achieved. The methodology included OsO4-catalysed dihydroxylation as well as regioselective epoxide opening followed by calcium borohydride reduction of the lactone moiety.
从(1R,5R,8R)-8-乙酰氧基-2-氧杂双环[3.3.5-deoxy-4a(R)-hydroxy-4a-carba-α-D-xylo-hexofuranose 23 和 4a(R)-hydroxy-2-amino-2,5-dideoxy-4a(R)-hydroxy-4a-carba-α-D-arabino-hexofuranose 1。该方法包括 OsO4 催化的二羟基化和区域选择性环氧化物开环,然后用硼氢化钙还原内酯分子。