Regioselective Diboration and Silaboration of Allenes Catalyzed by Au Nanoparticles
作者:Marios Kidonakis、Manolis Stratakis
DOI:10.1021/acscatal.7b04084
日期:2018.2.2
available supported Au nanoparticles on TiO2 (1 mol %), terminal allenes undergo diboration and silaboration exclusively on the terminal double bond, in high yields and stereoselectivity. In silaboration, the boron moiety (Bpin) is attached on the terminal carbon and the silyl group on the sp-C, a regioselectivity pattern that is unusual. No ligands or additives are required, while the catalyst is recyclable
Stereoselective Syntheses of γ-Boryl Substituted <i>syn</i>-β-Alkoxy- and <i>syn</i>-β-Amino-homoallylic Alcohols via a Regio- and Stereoselective Allene Diboration and Aldehyde Allylboration Reaction Sequence
作者:Jichao Chen、Shang Gao、John D. Gorden、Ming Chen
DOI:10.1021/acs.orglett.9b01535
日期:2019.6.21
Diastereoselective synthesis of γ-boryl substituted syn-β-alkoxy- or syn-β-amino-homoallylic alcohols is developed. Pt-catalyzed regioselective diboration of alkoxyallene or aminoallene with B2pin2 occurred at the terminal alkene unit of the allene to give (Z)-γ-alkoxy- or (Z)-γ-amino-β-boryl substituted allylboronates with high selectivities. Addition of the allylboronates to aldehydes followed by