Ni- and Pd-Catalyzed Synthesis of Substituted and Functionalized Allylic Boronates
摘要:
Two highly efficient and convenient methods for the synthesis of functionalized and substituted allylic boronates are described. In one procedure, readily available allylic acetates are converted to allylic boronates catalyzed by Ni/PCy3 or Ni/PPh3 complexes with high levels of stereoselectivity and in good yields. Alternatively, the borylation can be accomplished with commercially available Pd catalysts [e.g., Pd-2(dba)(3), PdCl2, Pd/C], starting with easily accessed allylic halides.
Chiral Phosphoric Acid-Catalyzed Enantio- and Diastereoselective Allylboration of Aldehydes with β,γ-Substituted Allylboronates
作者:Jinping Yuan、Pankaj Jain、Jon C. Antilla
DOI:10.1021/acs.joc.2c00764
日期:2022.6.17
The catalytic asymmetricaddition of β,γ-substituted allylboronates to aldehydes has been described. Promoted by 5 mol % chiral phosphoric acid, the reactions were broadly applicable, scalable, and efficient, allowing for the formation of 3,4-anti/syn-homoallylic alcohols bearing adjacent tertiary or quaternary stereogenic centers in a highly enantio- and diastereoselective manner (≤99% ee and dr >20:1)
已经描述了 β,γ-取代的烯丙基硼酸酯对醛的催化不对称加成。在 5 mol% 手性磷酸的促进下,该反应具有广泛的适用性、可扩展性和高效性,允许以高度对映和非对映选择性的方式形成带有相邻叔或季立体中心的 3,4-反/同-高烯丙醇(≤99% ee 和 dr >20:1)。涉及手性磷酸的刚性椅子状过渡态有助于高度控制的反应。
Hoffmann, Reinhard W.; Kemper, Bruno; Metternich, Rainer, Liebigs Annalen der Chemie, 1985, # 11, p. 2246 - 2260
作者:Hoffmann, Reinhard W.、Kemper, Bruno、Metternich, Rainer、Lehmeier, Thomas
DOI:——
日期:——
Hoffmann, Reinhard W.; Metternich, Rainer; Lanz, Joachim W., Liebigs Annalen der Chemie, 1987, p. 881 - 888
作者:Hoffmann, Reinhard W.、Metternich, Rainer、Lanz, Joachim W.
DOI:——
日期:——
HOFFMANN, R. W.;KEMPER, B., TETRAHEDRON LETT., 1981, 22, N 52, 5263-5266
作者:HOFFMANN, R. W.、KEMPER, B.
DOI:——
日期:——
HOFFMANN, REINHARD W.;METTERNICH, RAINER;LANZ, JOACHIM W., LIEBIGS ANN. CHEM.,(1987) N 10, 881-887
作者:HOFFMANN, REINHARD W.、METTERNICH, RAINER、LANZ, JOACHIM W.