Borylation of Propargylic Substrates by Bimetallic Catalysis. Synthesis of Allenyl, Propargylic, and Butadienyl Bpin Derivatives
摘要:
Bimetallic Pd/Cu and Pd/Ag catalytic systems were used for borylation of propargylic alcohol derivatives. The substrate scope includes even terminal alkynes. The reactions proceed stererospecifically with formal S(N)2' pathways to give allenyl boronates. Opening of propargyl epoxides leads to 1,2-diborylated butadienes probably via en allenylboronate intermediate.
Diverse Alkyl–Silyl Cross-Coupling via Homolysis of Unactivated C(sp<sup>3</sup>)–O Bonds with the Cooperation of Gold Nanoparticles and Amphoteric Zirconium Oxides
the degradation of polyesters and the synthesis of organosilanes were realized concurrently by the unique catalysis of supported gold nanoparticles. Mechanistic studies corroborated the notion that the generation of alkyl radicals is involved in C(sp3)–Si coupling and the cooperation of gold and an acid–base pair on ZrO2 is responsible for the homolysis of stable C(sp3)–O bonds. The high reusability and
Enantio- and Diastereodivergent N-Heterocyclic Carbene/Nickel Dual-Catalyzed Umpolung Propargylic Substitutions of Enals
作者:Lingzi Peng、Mingxu Wang、Jianming Huang、Chang Guo、Liu-Zhu Gong、Jin Song
DOI:10.1021/jacs.3c09569
日期:2023.12.27
combination of catalyst chirality, all four potential stereoisomers of α-quaternary propargylated oxindoles were synthesized in a predictable and precise way with remarkable yields, diastereoselectivities, and enantioselectivities from identical starting materials. The synthetic utility of this method was demonstrated in the concise asymmetric totalsynthesis of (−)-debromoflustramine B and (−)-C(β-Me)-debromoflustramine
包含多个连续立体中心并同时控制相对和绝对构型的有机化合物的完整立体异构体的产生仍然是合成化学中的重大挑战。利用协同催化策略,我们建立了N-杂环卡宾/镍催化的对映和非对映发散的炔丙基化反应,以得到3,3'-二取代的羟吲哚,从而能够合并内部炔烃官能团并引入单个季铵或邻位季铵/第三立体中心。通过选择合适的催化剂手性组合,以可预测且精确的方式合成了 α-季炔基化羟吲哚的所有四种潜在立体异构体,并从相同的起始原料中获得了显着的产率、非对映选择性和对映选择性。该方法的合成实用性在 (−)-去溴氟曲明 B 和 (−)-C (β-Me) -去溴氟曲明 B 的简明不对称全合成中得到了证明。
Geng, Lifeng; Lu, Xiyan, Journal of the Chemical Society. Perkin transactions I, 1992, # 1, p. 17 - 22
作者:Geng, Lifeng、Lu, Xiyan
DOI:——
日期:——
Borylation of Propargylic Substrates by Bimetallic Catalysis. Synthesis of Allenyl, Propargylic, and Butadienyl Bpin Derivatives
作者:Tony S. N. Zhao、Yuzhu Yang、Timo Lessing、Kálmán J. Szabó
DOI:10.1021/ja502792s
日期:2014.5.28
Bimetallic Pd/Cu and Pd/Ag catalytic systems were used for borylation of propargylic alcohol derivatives. The substrate scope includes even terminal alkynes. The reactions proceed stererospecifically with formal S(N)2' pathways to give allenyl boronates. Opening of propargyl epoxides leads to 1,2-diborylated butadienes probably via en allenylboronate intermediate.