Catalytic 1,3-Difunctionalisation of Organic Backbones through a Highly Stereoselective, One-Pot, Boron Conjugate-Addition/Reduction/Oxidation Process
作者:Cristina Solé、Amolak Tatla、Jose A. Mata、Andrew Whiting、Henrik Gulyás、Elena Fernández
DOI:10.1002/chem.201102081
日期:2011.12.9
enantioselectivity provided by the CuI catalyst modified with Josiphos‐ and Mandyphos‐type ligands has been examined. The oxidative substitution of the boryl unit with a hydroxyl group proceeds with complete retention of configuration at the Cβ‐atom. In parallel, the stoichiometric reduction of the imino or carbonyl group provides a second stereogenic centre. Depending on the nature of the reducing reagent
建立了简单的一锅三步合成路线,制备手性1,3-氨基醇和1,3-二醇。考虑到合成方案的整体立体控制,第一步和关键步骤分别是对映选择性的α,β-不饱和亚胺和酮的β-硼酸酯。研究了用Josiphos和Mandyphos型配体改性的Cu I催化剂提供的对映选择性。的甲硼烷基单元的氧化性取代与在C配置的完全保留的羟基进行β -原子。同时,亚氨基或羰基的化学计量还原提供了第二个立体定向中心。根据还原剂的性质,可以实现极高的非对映选择性,特别是对于合成试剂而言。-1,3-氨基醇和1,3-二醇