Highly (Z)-Selective Synthesis of β-Monosubstituted α,β-Unsaturated Cyanides Using the Peterson Reaction
摘要:
[GRAPHICS]The Peterson reaction between (t-BuO)Ph2SiCH2CN and various aidehydes furnishes the corresponding beta-monosubstituted alpha,beta-unsaturated cyanides with high Z selectivity (Z:E = 92:8 to > 98:2).
E- and Z-, di- and tri-substituted alkenyl nitriles through catalytic cross-metathesis
作者:Yucheng Mu、Thach T. Nguyen、Ming Joo Koh、Richard R. Schrock、Amir H. Hoveyda
DOI:10.1038/s41557-019-0233-x
日期:2019.5
the development of several efficient catalytic cross-metathesis strategies, which provide direct access to a considerable range of Z- or E-di-substituted cyano-substituted alkenes or their corresponding tri-substituted variants. Depending on the reaction type, a molybdenum-based monoaryloxide pyrrolide or chloride (MAC) complex may be the optimal choice. The utility of the approach, enhanced by an easy
bearing cyanomethyl, acetamide, and N,N-dimethylacetamide groups were examined for Wittig type reactions. All three reacted to give the corresponding olefins. The reaction of the cyanomethyl reagent with aldehydes gave α,β-unsaturated cyanides with high Z-selectivity in the case of aliphatic aldehydes (Z:E=94:6 to 99:1). On the other hand, the reactions of the two amide reagents with aldehydes yielded
A Facile, One-Pot Synthesis of β-Substituted (<i>Z</i>)-Acrylonitriles Utilizing an α-Diaminoboryl Carbanion
作者:Takashi Tomioka、Yusuke Takahashi、Trey G. Vaughan、Takayoshi Yanase
DOI:10.1021/ol100534s
日期:2010.5.21
A simple three-step single-pot procedure for Z-stereoselective synthesis of beta-monosubstituted acrylonitriles has been established. The reaction involves olefination of aldehydes with an in situ generated alpha-diaminoboryl carbanion species. Various aromatic and aliphatic aldehydes were smoothly converted into the corresponding (Z)-olefin products (up to 96:4 ratio) in good yields (80-98%).