Alkylation of silyl enolates with tert-alkyl or allylic fluorides proceeds smoothly in the presence of a catalytic amount of borontrifluoride to afford the corresponding carbonyl compounds. Allylation and reduction of alkylfluorides with allylsilane and hydrosilane, respectively, occur under BF3 catalysis.
A two-step mimic for direct, asymmetric bromonium- and chloronium-induced polyene cyclizations
作者:Scott A. Snyder、Daniel S. Treitler、Andreas Schall
DOI:10.1016/j.tet.2010.03.037
日期:2010.6
Although direct, asymmetric, halonium-induced cyclizations have proven difficult to achieve in the absence of enzymes, this report provides a two-step alternative based on reacting polyenes with chiral mercury(II) complexes to afford a number of polycyclic organomercurials that can be subsequently converted, with retention, into their corresponding chlorine, bromine, and iodine derivatives in good
Prenol and isoprenoids are common structural motifs in biological systems and possess diverse applications. An unprecedented direct catalytic prenylation of ketonesusing prenol is attained. This C–C bond formation reaction requires only a ruthenium pincer catalyst and a base, and H2O is the only byproduct.
异戊二烯和类异戊二烯是生物系统中常见的结构基序,具有多种应用。实现了使用异戊烯醇对酮进行前所未有的直接催化异戊二烯化。这种 C–C 键形成反应只需要一种钌钳形催化剂和一种碱,而 H 2 O 是唯一的副产物。
Julia,S. et al., Bulletin de la Societe Chimique de France, 1962, p. 1947 - 1952
作者:Julia,S. et al.
DOI:——
日期:——
Formation of C(sp<sup>3</sup>)–C(sp<sup>3</sup>) Bonds by Palladium Catalyzed Cross-Coupling of α-Diazoketones and Allylboronic Acids
作者:Marie-Charlotte Belhomme、Dong Wang、Kálmán J. Szabó
DOI:10.1021/acs.orglett.6b01132
日期:2016.5.20
Palladium catalyzed cross-coupling of allylboronic acids with a-diazoketones was studied. The reaction selectively affords the linear allylic product. The reaction proceeds with formation of a new C(sp(3))-C(sp(3)) bond. The reaction was performed without an external oxidant, likely without the Pd-catalyst undergoing redox reactions.