Decarboxylative Oxyacyloxylation of Propiolic Acids: Construction of Alkynyl-Containing α-Acyloxy Ketones
作者:Xin Chen、Yangchun Xin、Zhi-Wei Zhao、Yu-Jian Hou、Xiang-Xiang Wang、Wen-Jin Xia、Ya-Min Li
DOI:10.1021/acs.joc.1c00669
日期:2021.6.18
Novel decarboxylative oxyacyloxylation of propiolic acids has been developed. This reaction provides an efficient access to alkynyl-containing α-acyloxy ketones from readily available starting materials and exhibits significant functional group tolerance. Furthermore, oxyacyloxylation of terminal alkynes and aliphatic propiolic acids was also developed. A possible reaction mechanism is proposed based
The present invention relates to compounds of formula I:
1
wherein one of R
1
and R
4
is selected from the group consisting of H, and optionally substituted C
1-6
alkyl, C
3-7
cycloalkyl, C
3-7
cycloalkyl-C
1-4
alkyl, and phenyl-C
1-4
alkyl; and the other of R
1
and R
4
is an optionally substituted C
9-14
aryl group; R
2
and R
3
are either:
(i) independently selected from H, R, R′, SO
2
R, C(═O)R, (CH
2
)
n
NR
5
R
6
, where n is from 1 to 4 and R
5
and R
6
are independently selected from H and R, where R is optionally substituted C
1-4
alkyl, and R′ is optionally substituted phenyl-C
1-4
alkyl, or
(ii) together with the nitrogen atom to which they are attached, form an optionally substituted C
5-7
heterocyclic group; and their use as pharmaceuticals, in particular for treating conditions alleviated by the antagonism of a 5-HT
2B
receptor.
Straightforward and Highly Efficient Synthesis of α-Acetoxy Ketones through Gold-Catalyzed Intermolecular Oxidation of Terminal Alkynes
作者:Weimin He、Jiannan Xiang、Chao Wu、Zhiwu Liang、Dong Yan
DOI:10.1055/s-0033-1338513
日期:——
corresponding α-acetoxy ketones throughgold-catalyzedintermolecular oxidation in the presence of 8-methylquinoline 1-oxide as the oxidant. The reaction probably proceeds through an α-oxo gold carbene intermolecular O–H insertion. A variety of terminal alkynes were efficiently converted into the corresponding α-acetoxy ketones throughgold-catalyzedintermolecular oxidation in the presence of 8-methylquinoline
Copper(II) and 2,2′-Biimidazole-promoted Novel Reaction of 4,4,4-Trifluoro-1-phenylbutane-1,3-diones with Iodobenzene Diacetate
作者:Chunmei Zhou、Runsheng Zeng、Jianping Zou
DOI:10.1002/cjoc.201090069
日期:2010.2
A new and efficient way was developed to carry out the reaction of 4,4,4‐trifluoro‐1‐phenylbutane‐1,3‐dione with iodobenzene diacetate under the assistance of Cu(II) and 2,2′‐biimidazole at a low temperature in excellent yield. 2‐Acetoxyacetophenone was obtained unexpectedly.