Enantioselective Synthesis of Optically Active 3,3-Diarylpropanoates by Conjugate Hydrosilylation with Chiral Rh-bis(oxazolinyl)phenyl Catalysts
摘要:
Conjugate hydrosilylation of 3,3-diarylacrylate derivatives catalyzed by chiral rhodium-bis(oxazolinyl)phenyl complexes (1 mol %) at 60 degrees C for 2 h was investigated to prepare optically active 3,3-diarylpropanoate derivatives in high yields up to 99% yield and high enantioselectivities up to 99%.
Doubly Regioselective C–H Hydroarylation of Unsymmetrical Alkynes Using Carboxylates as Deciduous Directing Groups
作者:Agostino Biafora、Bilal A. Khan、Janet Bahri、Joachim M. Hewer、Lukas J. Goossen
DOI:10.1021/acs.orglett.7b00300
日期:2017.3.3
carbonate, and mesitoic acid efficiently promotes the doubly regioselectiveC–H hydroarylation of unsymmetrical alkynes. The process involves carboxylate-directed ortho-C–H bond activation followed by regioselective addition to the alkyne C–C triple bond with concerted decarboxylation. This action of the carboxylate as a deciduous directing group ensures exclusive monovinylation with high selectivity
由[(C 6 Me 6)RuCl 2 ] 2,碳酸钾/碳酸胍和甲基磺酸组成的催化剂体系有效地促进了不对称炔烃的双区域选择性C–H加氢芳基化。该过程涉及羧基定向的邻-C-H键活化,然后区域选择性地添加到炔烃C-C三键中,并伴有协同的脱羧作用。羧酸盐作为落叶指导基团的这种作用确保了对(E)-1,2-二芳基烯烃具有高选择性的排他性单乙烯基化。
Enantioselective Synthesis of Optically Active 3,3-Diarylpropanoates by Conjugate Hydrosilylation with Chiral Rh-bis(oxazolinyl)phenyl Catalysts
Conjugate hydrosilylation of 3,3-diarylacrylate derivatives catalyzed by chiral rhodium-bis(oxazolinyl)phenyl complexes (1 mol %) at 60 degrees C for 2 h was investigated to prepare optically active 3,3-diarylpropanoate derivatives in high yields up to 99% yield and high enantioselectivities up to 99%.