Nonenzymatic Enantioselective Monoacetylation of Prochiral 2-Protectedamino-2-alkyl-1,3-propanediols Utilizing a Chiral Sulfonamide−Zn Complex Catalyst
作者:Takashi Honjo、Michiyasu Nakao、Shigeki Sano、Motoo Shiro、Kentaro Yamaguchi、Yoshihisa Sei、Yoshimitsu Nagao
DOI:10.1021/ol063063g
日期:2007.2.1
presence of 5 mol % of chiral sulfonamide-Zn complex catalyst afforded the corresponding chiral monoacetyl products in 70-92% yields with 70-88% ee values. The proposed mechanism for the catalytic monoacetylation of a prochiral 1,3-propanediol was presented on the basis of CSI-MS analysis.
[结构:见正文]用Et(2)Zn处理手性磺酰胺可定量得到其Zn络合物,然后通过X射线晶体学分析确定其结构。前手性N-Boc-2-氨基-2-烷基-1,3-丙二醇与Ac(2)O在5 mol%手性磺酰胺-锌络合物催化剂存在下的反应在70-92中提供了相应的手性单乙酰基产物具有70-88%ee值的%产率。在CSI-MS分析的基础上,提出了前手性1,3-丙二醇催化单乙酰化的机理。