A C4-selective addition of soft copper-based silicon nucleophiles to pyridinium triflates allows for their enantioselective deraromatization in high yields and with excellent enantioselectivities (see scheme; (R,R)-Ph-BPE=1,2-bis[(2R,5R)-2,5-diphenylphospholan-1-yl]ethane). The thus-formed α-chiral silyl unit can be further used to control the stereoselectivity in subsequent transformations.
软铜基硅亲核试剂的 C4 选择性加成到三氟甲磺酸吡啶鎓中,使其能够以高产率和优异的对映选择性进行对映选择性去芳构化(参见方案;( R , R )-Ph-BPE=1,2-bis[(2 R , 5R )-2,5-二苯基磷杂环己烷-1-基]乙烷)。由此形成的α-手性甲硅烷基单元可以进一步用于控制后续转化中的立体选择性。
Reactivity of biologically important reduced pyridines. IV. Effect of substitution on ferricyanide-mediated oxidation rates of various 1,4-dihydropyridines
作者:Marcus E. Brewster、Agnes Simay、Klara Czako、David Winwood、Hassan Farag、Nicholas Bodor
DOI:10.1021/jo00276a039
日期:1989.7
Micellar catalysis of the basic hydrolysis of amides. 4. Substituted N,N-diphenyl benzamides
作者:Trevor J. Broxton、Denise R. Fernando、Jeffrey E. Rowe