Stereocontrolled Synthesis of Functionalized Bicyclic α-Methylene Butyrolactones via Tungsten-Mediated Intramolecular Allylation of Aldehydes
摘要:
The syntheses of a series of CpW(CO)(2)(pi-gamma-lactonyl) complexes bearing a tethered aldehyde are described. These pi-allyl complexes are prepared as either syn- or anti-stereoisomers. Treatment of these dicarbonyl complexes with NOBF4 and NaI in CH3CN effects an intramolecular allylation of the tethered aldehyde, yielding bicyclic alpha-methylene butyrolactones comprising a homoallylic alcohol. Both syn- and anti-isomers of tungsten-pi-allyl compounds produce the same alpha-methylene butyrolactones. The cyclizations proceed with high diastereoselectivities to give only the cis-fused bicyclic gamma-lactones. The preference for cis-fused stereoselection can be rationalized based on a tricyclic transition state mechanism.
Rh(<scp>iii</scp>)-Catalyzed olefination to build diverse oxazole derivatives from functional alkynes
作者:Yuan He、Ting Zheng、Yin-Hui Huang、Lin Dong
DOI:10.1039/d1ob00507c
日期:——
A novel Rh(III)-catalyzed olefination reaction of oxazoles to generate diverse oxazole skeleton derivatives has been realized by directly using oxazole as the directing group. The reaction could tolerate many functional groups, affording complex oxazolederivatives with long chain alkenyls in moderate to good yields, which might find applications in the construction of diverse compounds.
通过直接使用恶唑作为导向基团,实现了一种新颖的Rh( III )催化恶唑烯化反应生成多种恶唑骨架衍生物。该反应可以耐受许多官能团,以中等至良好的产率提供具有长链烯基的复杂恶唑衍生物,这可能在构建多种化合物中得到应用。
Asymmetric Synthesis of β-Lactams through Copper-Catalyzed Alkyne-Nitrone Coupling with a Prolinol-Phosphine Chiral Ligand
Prolinol–phosphine chiral ligands enabled highly enantioselective copper‐catalyzed intermolecular alkyne–nitrone coupling (Kinugasa reaction) to produce 1,3,4‐trisubstituted chiral β‐lactams. A high level of enantiocontrol was achieved not only with aryl‐ or alkenylacetylenes but also with alkylacetylenes, which were important but unfavorable substrates in the previously reported protocols. Two‐point