Asymmetric Desymmetrization of 2-Substituted 1,3-Propanediols by Using Oxazaborolidinone-Mediated Enantioselective Ring-Cleavage of Prochiral Acetal Derivatives
作者:Toshiro Harada、Keiko Imai、Akira Oku
DOI:10.1055/s-2002-31928
日期:——
Nonenzymatic desymmetrization of 2-substituted 1,3-propanediols leading to the enantiomerically enriched 3-benzyloxy-1-propanols was achieved by using oxazaborolidinone-mediated enantioselective ring-cleavage reaction of the dioxane acetal derivatives.
Asymmetric Desymmetrization of 2-Substituted 1,3-Propanediols via Catalytic Enantioselective Ring-Cleavage Reaction of Cyclic Acetal Derivatives
作者:Toshiro Harada、Koudai Shiraishi
DOI:10.1055/s-2005-871937
日期:——
Non-enzymatic desymmetrization of 2-substituted 1,3propanediols leading to the enantiomerically enriched 3-benzyloxy-1-propanols was achieved by using oxazaborolidinone-catalyzed enantioselective ring-cleavage reaction ofthe cyclic acetal derivatives with dimethylsilyl ketene S,O-acetal as a key reaction.
Copper-Catalyzed Enantioselective Hydroboration of Unactivated 1,1-Disubstituted Alkenes
作者:Won Jun Jang、Seung Min Song、Jong Hun Moon、Jin Yong Lee、Jaesook Yun
DOI:10.1021/jacs.7b08379
日期:2017.10.4
We report an efficient and highly enantioselectivehydroboration of aliphatic 1,1-disubstitutedalkenes with pinacolborane using a phosphine-Cu catalyst. The method allows facile preparation of enantiomerically enriched β-chiral alkyl pinacolboronates from a range of 1,1-disubstitutedalkenes with high enantioselectivity up to 99% ee. Unprecedented enantiodiscrimination between the geminal alkyl substituents