Cu(I)-Catalysed coupling of Arylsulfinic Salts with Aryl Bromides
作者:Yao Peng
DOI:10.3184/174751914x14034421692005
日期:2014.7
An efficient Cu(I)-catalysed synthesis of diarylsulfones from arylsulfinic acid salts and aryl bromides in 1,3-dimethyl-2-imidazolidinone at 80 °C in the presence of CuBr and pyridine has been developed. The high-yielding process exhibits significant functional group tolerance and allows for the preparation of a number of diarylsulfones under mild conditions.
There are disclosed a composition comprising
(E)-1,4-dibromo-2-methyl-2-butene and
(Z)-1,4-dibromo-2-methyl-2-butene, wherein the ratio of the E isomer to the total amount of the E and Z isomers is 0.9 or more; a process for producing the same and a process using the same to produce an allyl halide compound of formula (1):
1
wherein X denotes a bromine atom,
Y denotes an ArS(O)
2
group or an RCOO group,
wherein Ar denotes an aryl group which may be substituted and R denotes a hydrogen atom, a lower alkyl group or an aryl group which may be substituted, and
the wavy line means that the derivative is a mixture of an E or Z geometrical isomer.
作者:Xiangzhang Tao、Shengyang Ni、Lingyu Kong、Yi Wang、Yi Pan
DOI:10.1039/d1sc06760e
日期:——
A photocatalyzed 1,3-boron shift of allylboronic esters is reported. The boron atom migration through the allylic carbon skeleton proceeds via consecutive 1,2-boron migrations and Smiles-type rearrangement to furnish a variety of terminally functionalized alkyl boronates. Several types of migrating variations of heteronuclei radicals and dearomatization processes are also tolerated, allowing for further
Symmetrical diaryl sulfides and diaryl disulfides have been efficiently and selectively constructed via the homocoupling of sodium arenesulfinates. The selectivity of products relied on the different reaction systems: symmetrical diaryl sulfides were predominately obtained under the Pd(OAc)2 catalysis, whereas symmetrical diaryl sulfides were exclusively yielded in the presence of the reductive Fe/HCl
Enantioselective Sulfonation of Enones with Sulfinates by Thiourea/Tertiary-Amine Catalysis
作者:Guang-xun Li、Jin-zhong Zhao、Si-fan Wang、Ming Yan、Jin-yi Shi
DOI:10.1055/a-2202-0842
日期:——
substrates that could be converted into sulfinic acids by treatment with boric acid. The bifunctional catalyst forms a chiral ion pair with the sulfinic acid and controls the enantioselectivity of the sulfonation through hydrogen bonding.