Sulfonylation of Propargyl Alcohols with Sulfinamides for the Synthesis of Allenyl Sulfones
作者:Fei-Fei Zou、Zhen Luo、Yu-Ting Yang、Xin Zhuang、Chuan-Ming Hong、Zheng-Qiang Liu、Wan-Fang Li、Qing-Hua Li、Tang-Lin Liu
DOI:10.1021/acs.joc.2c01495
日期:2022.11.18
A regio- and chemoselective sulfonylation of propargyl alcohols with sulfinamides in 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) was developed. It provided straightforward and mild access to multi-substituted allenyl sulfones by using sulfinamides as the sulfonyl sources. This transformation was promoted by HFIP and did not require any catalysts or oxidants, which allowed for the successful conversion
4-phosphinoylcyanation of 1,3-enynes with diarylphosphine oxides and trimethylsilyl cyanide. The reaction produced various tetrasubstituted phosphinoyl- and cyano-containing allenes with high functional group compatibilities in good yields under mild reaction conditions. A preliminary reaction mechanism involving the formation of phosphinoyl radicals and their regioselective addition to 1,3-enynes was also proposed
Efficient catalytic transition-metal-free conditions for nucleophilic addition of arylacetylenes to aromatic ketones
作者:Junfeng Liu、Jin Lin、Ling Song
DOI:10.1016/j.tetlet.2012.02.058
日期:2012.4
A mild, efficient, and transition-metal-free method for nucleophilic addition of arylacetylenes to diverse aromatic ketones, using catalytic amount of tetrabutylammonium chloride as a promoter and solid KOH as a base in THF, was developed to afford aromatic tertiary propargylic alcohols with high and excellent yields. Aliphatic ketones also gave satisfactory results. (c) 2012 Elsevier Ltd. All rights reserved.
Regiospecific 6-<i>Endo</i>-Annulation of <i>in Situ </i>Generated 3,4-Dienamides/Acids: Synthesis of δ-Lactams and δ-Lactones
作者:Ying Liu、Badru-Deen Barry、Haifeng Yu、Jianquan Liu、Peiqiu Liao、Xihe Bi
DOI:10.1021/ol4007772
日期:2013.6.7
A novel and efficient method for the construction of alpha-(1,3-dithiolan-2-ylidene) delta-lactam and delta-lactone rings has been developed. It involves the reglospecific 6-endo-annulation of in situ generated 2-(1,3-dithiolan-2-ylidene)-3,4-dienamides/acids from the dehydrative coupling of alpha-oxo ketene dithioacetals with tertiary propargyl alcohols promoted by BF3 center dot Et2O. A range of alpha-(1,3-dithiolan-2-ylidene) delta-lactams and delta-lactones are obtained in good to high yields. In addition, indenes are prepared by using alpha-acetyl ketene dithioacetal as the precursor.
Iron(III)-Catalyzed Dehydration C(sp2)-C(sp2) Coupling of Tertiary Propargyl Alcohols and α-Oxo Ketene Dithioacetals: A New Route to gem-Bis(alkylthio)-Substituted Vinylallenes
作者:Guangbo Che、Xihe Bi、Qian Li、Yeming Wang、Zhongxue Fang、Peiqiu Liao、Badru-Deen Barry
DOI:10.1055/s-0032-1316855
日期:——
A new and efficient synthetic approach to [gem-bis(alkylthio)vinyl]allenes has been developed involving iron(III)-catalyzed dehydration C(sp(2))-C(sp(2)) coupling of tertiary propargyl alcohols and alpha-oxo ketene dithioacetals, affording a variety of [gem-bis(alkylthio)vinyl]allenes in good to excellent yields.