novel route to afford 1,1-diarylalkane derivatives from simple and readily available alkyl and aryl halides in good yields and excellent regioselectivities under mild conditions. The procedure shows good tolerance for a broad variety of functional groups and both primary and secondary alkyl halides can be used. Furthermore, the reaction was successfully scaled up to the multigram scale proving the
A simple and efficient alkylation of aromatic and heteroaromatic compounds via the direct SN1-type nucleophilic substitution of benzylic alcohols in the presence of catalytic amounts of the strong Brønsted acid o-benzenedisulfonimide under neat conditions is herein reported. A library of di- and triaryl (and heteroaryl) methanes was prepared in good yields and high regioselectivity. The observed reactivity
本文报道了在纯净条件下,在催化量的强布朗斯台德酸邻苯二磺酰亚胺存在下,通过苄基醇的直接S N 1型亲核取代,对芳香族和杂芳香族化合物进行的简单有效烷基化。以高收率和高区域选择性制备了二芳基和三芳基(和杂芳基)甲烷的库。已证明观察到的反应性与Mayr的亲核性和亲电子性等级相符。
Replacing halogenated solvents by a butyl acetate solution of bisphenol S in the transformations of indoles
A butyl acetate solution of bisphenol S (BPS) was proved to be able to replace hazardous halogenated solvents in the transformation of indoles. Measurement with Kamlet–Taft solvatochromic parameters disclosed that the polarity of the BPS-containing butyl acetate was enhanced greatly. The protocol not only conferred a convenient way to minimize the use of halogenated solvents in the synthesis of indole
Nickel-catalysed chemoselective C-3 alkylation of indoles with alcohols through a borrowing hydrogen method
作者:Amreen K. Bains、Ayanangshu Biswas、Debashis Adhikari
DOI:10.1039/d0cc07169b
日期:——
A nickel catalysed chemoselective C3-alkylation of indole is reported that follows a borrowing hydrogen method promoted by a radical.
一种镍催化的化学选择性C3-吲哚烷基化反应报道了,该反应遵循了由自由基促进的借氢方法。
From Waste Biomass to Solid Support: Lignosulfonate as a Cost-Effective and Renewable Supporting Material for Catalysis
作者:Shaohuan Sun、Rongxian Bai、Yanlong Gu
DOI:10.1002/chem.201303364
日期:2014.1.7
2) lignin‐SO3Cu(OTf), and 3) lignin‐IL@NH2 (IL=ionic liquid). These solidmaterials were then examined in many organic transformations. It was finally found that, compared with its homogeneous counterpart as well as some other solid catalysts that are prepared by using different supports with the same metal or catalytically active species, the lignin‐supported catalysts showed better performance in these reactions