Highly Diastereoselective and Stereodivergent Dihydroxylations of Acyclic Allylic Amines: Application to the Asymmetric Synthesis of 3,6-Dideoxy-3-amino-<scp>l</scp>-talose
作者:Kristína Csatayová、Stephen G. Davies、James A. Lee、Paul M. Roberts、Angela J. Russell、James E. Thomson、David L. Wilson
DOI:10.1021/ol200717n
日期:2011.5.20
diastereofacial selectivity to give the (R,R,R,R,R)-diastereoisomer (in 95:5 dr). The amino triols resulting from these dihydroxylation reactions are useful for further elaboration, as demonstrated by the asymmetric synthesis of 3,6-dideoxy-3-amino-l-talose.
的氨羟化叔丁基山梨酸[叔丁基(ê,ê) -六-2,4-二烯酸酯]使用对映体纯锂([R - )ñ苄基ñ - (α -甲基苄基)酰胺和( - ) - camphorsulfonyloxaziridine给出叔丁基(R,R,R,E)-2-羟基-3- [ N-苄基-N-(α-甲基苄基)氨基]己-4-烯酸酯> 99:1 dr。随后在Upjohn条件下进行二羟基化(OsO 4 / NMO),得到叔丁基(2 R,3 R,4 S,5小号,α - [R)-2,4,5-三羟基-3- [ Ñ苄基Ñ - (α -甲基苄基)氨基]己酸(95:5,DR)而多诺霍条件下二羟基化(OSO 4 / TMEDA )进行对映体非对映体选择性生成(R,R,R,R,R,R)-非对映异构体(95:5 dr)。由这些二羟基化反应产生的氨基三醇可用于进一步的修饰,如3,6-二脱氧-3-氨基-1-塔洛糖的不对称合成所证明的。