primary allylicamines was substituted directly by sulfinate salts with excellent regio- and stereoselectivities. In the presence of 0.1 mol % [Pd(allyl)Cl](2), 0.4 mol % 1,4-bis(diphenylphosphino)butane (dppb), and excess boric acid, a range of α-unbranched primary allylicamines were smoothly substituted with sodium sulfinates in an α-selective fashion to give structurally diverse allylic sulfones
Regioselective Single-Electron Tsuji–Trost Reaction of Allylic Alcohols: A Photoredox/Nickel Dual Catalytic Approach
作者:Zheng-Jun Wang、Shuai Zheng、Eugénie Romero、Jennifer K. Matsui、Gary A. Molander
DOI:10.1021/acs.orglett.9b02473
日期:2019.8.16
A radical-mediated functionalization of allyl alcohol derived partners with a variety of alkyl 1,4-dihydropyridines via photoredox/nickel dual catalysis is described. This transformation transpires with high linear and E-selectivity, avoiding the requirement of harsh conditions (e.g., strong base, elevated temperature). Additionally, using aryl sulfinate salts as radical precursors, allyl sulfones
A regio‐ and stereoselective synthesis of sulfones and thioethers by means of CuI‐catalyzedaerobicoxidativeNS bond cleavage of sulfonyl hydrazides, followed by cross‐coupling reactions with alkenes and aromatic compounds to form the CS bond, is described herein. N2 and H2O are the byproducts of this transformation, thus offering an environmentally benign process with a wide range of potential
A method is presented for the direct substitution of allylic alcohols with sodium arylsulfinates. The process involves a cooperative action of palladium catalysts, phenylboronic acid and titanium tetraisopropoxide. By taking advantage of this protocol, we achieved a concise synthesis of bicalutamide, an anti-androgen compound for treating prostate cancer.
A combination of Pd(OAc)2 (5 mol %), PPh3 (10 mol %), and Et3B (200 mol %) promotes the formation of allyl phenyl sulfones from the allylic alcohols directly with excellent yields under mild conditions. The activation of an alcohol group is not necessary which is achieved in situ. The conjugated dienols also were equally effective for the said transformation.