Convenient synthesis of arylpropargyl aldehydes and 4-aryl-3-butyn-2-ones from arylacetylenes and amide acetals
作者:Ka Young Lee、Mi Jung Lee、Saravanan GowriSankar、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2004.04.193
日期:2004.6
The reaction of arylacetylenes 1 and N,N-dimethylformamide dimethylacetal (2a, DMF-DMA) afforded the corresponding arylpropargyl aldehydes 3 in moderate yields. Similarly, the reaction of 1 and N,N-dimethylacetamide dimethylacetal (2b, DMA-DMA) gave 4-aryl-3-butyn-2-ones 4.
Synthesis of 3,4-Dimethylidene Oxacycles through Prins-Type Cyclization of Allenylmethylsilanes
作者:Punna Reddy Ullapu、Young Seub Kim、Jae Kyun Lee、Ae Nim Pae、Youseung Kim、Sun-Joon Min、Yong Seo Cho
DOI:10.1002/asia.201100162
日期:2011.8.1
efficient synthesis of 3,4‐dimethylidene oxacycles including oxolanes and oxepanes through Prins‐type cyclization of hydroxy(allenylmethyl)silanes is described. We have shown that 2‐substituted tetrahydrofuran derivatives could be produced by using this strategy although the 5‐endo‐trig cyclization mode is stereoelectronically disfavored. We also applied our method to the stereoselectivesynthesis of 2
Stereoselective Oxa‐Michael Addition of Tyrosine to Propargyl Aldehyde/Esters: Formation of Benzofurans and Flavones
作者:Stanley N. S. Vasconcelos、Isadora Maria Oliveira、Anwar Shamim、Julio Zukerman‐Schpector、Daniel C. Pimenta、Hélio A. Stefani
DOI:10.1002/adsc.201900564
日期:2019.9.17
oxa‐Michael addition of the phenol moiety present in tyrosine and 3‐iodotyrosine to different propargyl aldehydes delivered products with predominantly Z stereochemistry, as evidenced by X‐ray crystallography analysis. When ethyl propiolate was used as the propargyl ester source, the products were achieved with exclusively E stereochemistry with yields ranging from 17% to 91%. The oxa‐Michael addition compounds