Diastereoselective allylation and crotylation of N-unsubstituted imines derived from ketones
作者:Bhartesh Dhudshia、Jorge Tiburcio、Avinash N. Thadani
DOI:10.1039/b511411j
日期:——
A wide variety of tertiary carbinamines are synthesized in high yields via diastereoselective allylation and crotylation of in situ generated N-unsubstituted ketimines.
Enantioselective Synthesis and Cross-Coupling of Tertiary Propargylic Boronic Esters Using Lithiation-Borylation of Propargylic Carbamates
作者:Benjamin M. Partridge、Laëtitia Chausset-Boissarie、Matthew Burns、Alexander P. Pulis、Varinder K. Aggarwal
DOI:10.1002/anie.201203198
日期:2012.11.19
Lithiation–borylation of propargyliccarbamates leads to tertiarypropargylicboronicesters in very high e.r., provided that ethylene glycol boronicesters are used. These versatile intermediates undergo a range of highly stereoselective transformations, including protodeboronation to give tertiary allenes and Suzuki–Miyaura cross‐couplings of tertiaryboron species leading to tetrasubstituted allenes
Catalytic Use of Zinc Amide for Transmetalation with Allylboronates: General and Efficient Catalytic Allylation of Carbonyl Compounds, Imines, and Hydrazones
The efficient catalytic allylation of ketones, imines, and hydrazones with allylboronates using a catalytic amount of zinc amide is reported. In this reaction, the boron‐to‐zinc exchange process occurred smoothly to afford the corresponding allylzinc amides, and the desired allylation reactions proceeded in high efficiency (∼0.1 mol%). A mechanistic study revealed that transmetalation was a rate‐determining
Zn-Catalyzed Asymmetric Allylation for the Synthesis of Optically Active Allylglycine Derivatives. Regio- and Stereoselective Formal α-Addition of Allylboronates to Hydrazono Esters
have developed Zn-catalyzed asymmetricallylation of hydrazonoesters with allylboronates. The reactions proceeded smoothly in high yields and high stereoselectivities. Remarkably, formal α-addition occurred for α-substituted allylboronates exclusively, and excellent stereoselectivities were observed. This is the first example of catalytic regio- and stereoselective allylations with formal α-addition.
METHODS OF PREPARING TERTIARY CARBINAMINE COMPOUNDS
申请人:Thadani Avinash N.
公开号:US20080139847A1
公开(公告)日:2008-06-12
The present invention relates to a method for the preparation of tertiary carbinamine compounds from diastereoselective allylation and crotylation of N-unsubstituted imines derived from ketones.