Expedient Synthesis of Highly Substituted Pyrroles via Tandem Rearrangement of α-Diazo Oxime Ethers
作者:Yaojia Jiang、Wei Chuen Chan、Cheol-Min Park
DOI:10.1021/ja300552c
日期:2012.3.7
An efficient rhodium-catalyzed synthesis of 2H-azirines and pyrroles has been developed. Novel rearrangement of α-oximino ketenes derived from α-diazo oxime ethers provides 2H-azirines bearing quaternary centers and allows for subsequent rearrangement to highly substituted pyrroles in excellent yields.
Zr(OtBu)4 was found to catalyze the Tishchenko reduction of β-hydroxy ketones giving rise to differentiated 1,3-anti-diol monoesters in high yields and excellent stereoselectivity.
Stereoselective addition of organometallic reagents to β-hydroxyketones
作者:José Luis Garcia Ruano、Amelia Tito、Rafael Culebras
DOI:10.1016/0040-4020(95)01048-3
日期:1996.2
Reactions of several β-hydroxyketones with different methylation reagents are reported. The de's are moderated or good (40–75%) and slightly change with the relative steric size of the R groups at the starting hydroxyketone. The syn-diols are predominant in reactions with Me3Al/ZnBr2 and MeLi/Me3Al, whereas the anti-diols are the major ones with MeLi/ZnBr2. The method has been used to synthesize optically