A Stereoselective Approach to 1,3-Amino Alcohols Protected as Cyclic Carbamates: Kinetic vs. Thermodynamic Control
作者:Garance Broustal、Xavier Ariza、Jean-Marc Campagne、Jordi Garcia、Yohan Georges、Angela Marinetti、Raphaël Robiette
DOI:10.1002/ejoc.200700503
日期:2007.9
which were converted into the corresponding dicarbamates with tosyl isocyanate. Stereoselective cyclization of these dicarbamates proceeded with 1,3-asymmetric induction under either thermodynamic or kinetic control to afford enantioselectively six-membered-ring cyclic carbamates. Calculations enabled us to rationalize the observed stereoselectivity. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim
描述了对被保护为环状氨基甲酸酯的 1,3-氨基醇的直接对映控制访问。该方法基于在 10% 的 Carreira 催化剂存在下将二烯醇甲硅烷基酯添加到醛中(添加乙烯基向山醛醇)。获得的δ-羟基酯被还原为戊-2-烯-1,5-二醇,其与异氰酸甲苯基酯一起转化为相应的二氨基甲酸酯。这些二氨基甲酸酯的立体选择性环化在热力学或动力学控制下进行 1,3-不对称诱导,以提供对映选择性六元环环状氨基甲酸酯。计算使我们能够合理化观察到的立体选择性。((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)。