Tert-Butyldiphenylsilylmethyl Triflate: Preparation and Dipolar Cycloaddition Reactions of 1-(Tert-Butyldiphenylsilylmethyl)-6-Cyano-4-Methyl-1,2,5,6-Tetrahydropyridine
摘要:
Alkylation of substituted pyridines with tert-butyldiphenylsilylmethyl triflate provides N-[tert-butyldiphenylsilylmethyl]pyridinium triflates in excellent yields. Reductive cyanation of the pyridinium triflates provides 1-(tert-butyldiphenylsilylmethyl)-6-cyano-1,2,5,6-tetrahydropyridines, azomethine ylid precursors, in modest yields. An unexpected dipolar cycloaddition reaction of an ylid derived from the title 6-cyanopiperidine is described.
Enantioconvergent and Regioselective Synthesis of Allenylsilanes by Nickel-Catalyzed C(sp<sup>2</sup>)–C(sp<sup>3</sup>) Cross-Coupling Starting from Racemic α-Silylated Propargylic Bromides
作者:Yan Xu、Hong Yi、Martin Oestreich
DOI:10.1021/acs.organomet.1c00112
日期:2021.7.26
A direct synthesis of enantioenriched allenylsilanes fromracemic α-silylated propargylic bromides by an enantioconvergent nickel-catalyzed cross-coupling is reported. The high regioselectivity is governed by the bulky silyl group, and the C(sp2)–C(sp3) bond formation occurs exclusively at the γ-position of the propargyl electrophile. The level of enantioselection induced by a chiral Pybox ligand is
<i>Tert</i>-Butyldiphenylsilylmethyl Triflate: Preparation and Dipolar Cycloaddition Reactions of 1-(<i>Tert</i>-Butyldiphenylsilylmethyl)-6-Cyano-4-Methyl-1,2,5,6-Tetrahydropyridine
作者:David J. Hart、Ying Huan
DOI:10.1080/00397910008086931
日期:2000.9
Alkylation of substituted pyridines with tert-butyldiphenylsilylmethyl triflate provides N-[tert-butyldiphenylsilylmethyl]pyridinium triflates in excellent yields. Reductive cyanation of the pyridinium triflates provides 1-(tert-butyldiphenylsilylmethyl)-6-cyano-1,2,5,6-tetrahydropyridines, azomethine ylid precursors, in modest yields. An unexpected dipolar cycloaddition reaction of an ylid derived from the title 6-cyanopiperidine is described.