以优异的对映选择性和高产率实现了用于合成半缩醛的乙烯基羰基化合物的有机催化 α-烷基化反应生成羟基硝基烯烃。通过添加 Et 3 N实现了高非对映选择性(高达 >20:1)。乙烯基酮对硝基烯烃的 α-和 γ-烷基化显示出高但相反的表面选择性。已证明半缩醛产物转化为其他多环化合物,包括euroticin B 类似物。
ELECTROREDUCTIVE ACYLATION OF BENZYL CHLORIDE AND RELATED COMPOUNDS WITH ACID CHLORIDES
作者:Tatsuya Shono、Ikuzo Nishiguchi、Hiroshi Ohmizu
DOI:10.1246/cl.1977.1021
日期:1977.9.5
The electroreduction of benzyl chloride and relatedcompounds in the presence of acid chlorides gave alkyl benzyl ketones in moderate yields. The controlled potential electrolysis suggests that the electron transfer from the cathode to benzyl chloride yielding an anionic species is the initiation step of this reductive acylation.
Palladium catalyzed reaction of acyltins with organichalides were investigated. Among the halides, acyl halides and allylic halides were good substrates, and the latter gave allylic ketones in good yields.
Control of the Organocatalytic Enantioselective α-Alkylation of Vinylogous Carbonyl Enolates for the Synthesis of Tetrahydropyran Derivatives and Beyond
The organocatalytic α-alkylation of vinylogous carbonyl compounds to hydroxynitroolefins for the synthesis of hemiacetals was realized with excellent enantioselectivities and in high yields. High diastereoselectivity (up to >20:1) has been accomplished with the addition of Et3N. The α- and γ-alkylation of vinylogous ketone against nitroolefins displayed high but opposite facial selectivities. Transformation
以优异的对映选择性和高产率实现了用于合成半缩醛的乙烯基羰基化合物的有机催化 α-烷基化反应生成羟基硝基烯烃。通过添加 Et 3 N实现了高非对映选择性(高达 >20:1)。乙烯基酮对硝基烯烃的 α-和 γ-烷基化显示出高但相反的表面选择性。已证明半缩醛产物转化为其他多环化合物,包括euroticin B 类似物。
Broekhof, N. L. J. M.; Elburg, P. van; Hoff, D. J., Recueil des Travaux Chimiques des Pays-Bas, 1984, vol. 103, # 11, p. 317 - 321
作者:Broekhof, N. L. J. M.、Elburg, P. van、Hoff, D. J.、Gen, A. van der