A Highly Efficient Pinacol Coupling Approach to Trehazolamine Starting from <scp>d</scp>-Glucose
作者:Isabel Storch de Gracia、Hansjörg Dietrich、Sofía Bobo、Jose Luis Chiara
DOI:10.1021/jo980831b
日期:1998.8.1
is 39% over nine steps from 2,3,4,6-tetra-O-benzyl-D-glucose (5). An even shorter synthesis of 30, a diastereoisomeric analogue of 3, is also described starting from 5. The key transformation in this second route is a highly stereoselective ketone oxime ether reductive carbocyclization promoted also by samarium diiodide. The overall yield of 30 is 57% over four steps from 5.
从D-葡萄糖开始,即可快速有效地合成海藻糖胺(3),即强效海藻糖酶抑制剂海藻灵(2)的糖苷配基。该方法的关键转化是高产率的两步一锅法序列,该序列由1,5-二醇的Swern氧化,然后由碘化sa促进的所得1,5-二羰基化合物的还原碳环化组成。从2,3,4,6-四-O-苄基-D-葡萄糖(5)在9个步骤中,3的总产率为39%。还描述了从5开始甚至更短的30(非对映异构体类似物3)的合成。在第二种途径中的关键转化是也由二碘化stereo促进的高度立体选择性的酮肟肟醚还原碳环化反应。从5开始的四个步骤中,30的总产率为57%。