Expedient Diels–Alder assembly of 4-aryl-4-phenylsulfonyl cyclohexanones
摘要:
The efficient preparation of 4-aryl-4-phenylsulfonyl cyclohexanones. containing a quaternary sulfone-bearing carbon centre, is described. Their synthesis proceeds in 38-78% overall yield by way of three steps: (i) sulfinate alkylation: (ii) methylenation: and (iii) regioselective Diels-Alder condensation with 2-trimethylsiloxybutadiene. The scope and limitations of the one-pot Mannich-type methylenation described were examined. (C) 2004 Elsevier Ltd. All rights reserved.
Efficient New Protocol to Synthesize Aromatic and Heteroaromatic Dithioesters
作者:Serge Masson、Isabelle Abrunhosa、Mihaela Gulea
DOI:10.1055/s-2004-822311
日期:——
A very efficient, high yielding procedure to synthesize substituted aromatic and heteroaromatic dithioesters is described. It involves the reaction between (phenylsulfonyl)methyl (hetero)aromatic derivatives and elemental sulfur in basic medium, followed by alkylation.
Remote Nucleophilic Allylation by Allylrhodium Chain Walking
作者:Alistair Groves、Jose I. Martínez、Joshua J. Smith、Hon Wai Lam
DOI:10.1002/chem.201803574
日期:2018.9.12
Metal migration through a carbon chain is a versatile method for achieving remote functionalization. However, almost all known examples involve the overall net migration of alkylmetal species. Here, we report that allylrhodiumspecies obtained from hydrorhodation of 1,3‐dienes undergo chainwalking toward esters, amides, or (hetero)arenes over distances of up to eight methylene units. The final, more
One-pot synthesis of sulfones via Ni(II)-catalyzed sulfonylation of boronic acids, Na2S2O5 and benzylic ammonium salts
作者:Haibo Zhu、Yishuai Liu、Yingying Zhang、Liu Yang、Jia Meng、Qian Li、Bozhen Gong、Zongbo Xie、Zhang-Gao Le
DOI:10.1016/j.mcat.2021.111500
日期:2021.4
from readily available boronic acids, sodium metabisulfite and benzylic ammonium salts as electrophiles is described. This general and efficient synthetic process is of broad scope, occurs in two steps, and delivers structural diverse sulfones, and the intermediate sulfinate is isolated. The transformation exhibits application of benzylic ammonium salts as novel electrophiles for direct insertion of
Nickel catalyzed three-component sulfonylation of non-activated alkyl chlorides
作者:Chang Gu、Zhuochen Wang、Renyi Shi
DOI:10.1039/d3cc01447a
日期:——
of readily available non-activated alkyl chlorides. A wide range of alkylarylsulfones can be synthesized from alkyl chlorides, aryl boronic acids, and potassium metabisulfite, a cheap, efficient, and commercially available SO2 source under simple and easy-to-handle reaction conditions. High selectivity can be achieved with a slight excess of phenylboronic acid and a sulfur dioxide source.
我们描述了镍催化的三组分磺酰化现成的非活化烷基氯。可以在简单且易于处理的反应条件下,从烷基氯、芳基硼酸和焦亚硫酸钾合成各种烷基芳基砜,焦亚硫酸钾是一种廉价、高效且可商购的 SO 2 来源。稍微过量的苯基硼酸和二氧化硫源可以实现高选择性。