Palladium-Catalyzed Cross-Coupling of Unactivated Alkenes with Acrylates: Application to the Synthesis of the C13-C21 Fragment of Palmerolide A
作者:Zhen-Kang Wen、Yun-He Xu、Teck-Peng Loh
DOI:10.1002/chem.201201806
日期:2012.10.15
Diene to meet: A palladium‐catalyzed cross‐coupling reaction between alkyl‐substitutedolefins and acrylates gives the corresponding butadienes in moderate yield and stereoselectivity. This atom‐economical reaction, which forms C–C bonds, tolerates a wide range of allylic and homoallylic alcohols, and acrylates (see scheme; TIPS =triisopropylsilyl). The methodology was applied to the synthesis of the
作者:Benjamin M. Partridge、Francesca M. Dennis、Craig C. Robertson
DOI:10.1055/s-0039-1690091
日期:2020.7
A nickel catalyst for the allylboration of aldehydes is reported, facilitating the preparation of homoallylic alcohols in high diastereoselectivity. The observed diastereoselectivities and NMR experiments suggest that allylation occurs through a well-defined six-membered transition state, with nickel acting as a Lewis acid.
Pd(0) catalyzed intramolecular Heck reaction: a versatile route for the synthesis of 2-aryl substituted 5-, 6-, and 7-membered O-containing heterocycles
作者:Shubhankar Samanta、Hemakesh Mohapatra、Rathin Jana、Jayanta K. Ray
DOI:10.1016/j.tetlet.2008.09.162
日期:2008.12
An efficient and convenient method for the synthesis of 2-aryl substituted tetrahydropyran, tetrahydrofuran, and oxepine derivatives via intramolecular palladium catalyzed cyclization is developed. The two exo-cyclic double bonds at adjacent carbon atoms in these ring systems could serve as potential dienes for cycloadditionreactions.
Synthetic equivalents: 1‐Alkenylboronates perform the role of an allylating reagent. Their reaction with aldehydes in the presence of a cationic rhodium(I)/dppm catalyst results in a highly diastereoselective production of anti‐configured homoallylic alcohols (see scheme; Bpin=4,4,5,5‐tetramethyl‐1,3,2‐dioxaborolanyl).
palladium(0) complex has been prepared from γ-chloropropyltriethoxysilane via immobilization on fumed silica, followed by reacting with potassium diphenylarsenide and palladium chloride, and then the reduction with hydrazine hydrate. The palladium(0) complex has been found to catalyze the allylation of aldehydes via the formation of π-allylpalladiumcomplexes, using allylic chlorides as allylating