Dioxygen-Triggered Oxosulfonylation/Sulfonylation of Terminal Olefins toward β-Keto Sulfones/Sulfones
作者:Yanjie Wang、Yuhan Zhao、Changqun Cai、Lingyun Wang、Hang Gong
DOI:10.1021/acs.orglett.1c03049
日期:2021.11.5
A dioxygen-triggered oxosulfonylation/sulfonylation of unactivated olefins to achieve β-keto sulfones/sulfones has been developed. Interestingly, pluralistic mechanisms were found when different types of compounds were applied as substrates, and different products were achieved. The reaction is carried out with a high atomic efficiency in the absence of a metal and a catalyst at room temperature under
synthesis of chalcones and flavanones has been described. 2-(Benzo[d]thiazol-2-ylsulfonyl)-1-phenylethanones have been developed as new reagents for direct Julia–Kocienski olefination with aldehydes in the presence of a base, afforded chalcones in good to excellent yields. Whereas, 2-(benzo[d]thiazol-2-ylsulfonyl)-1-(2-hydroxyphenyl)ethanone reacted with the aromatic aldehydes to furnish flavanones
已经描述了朱莉娅-科辛斯基烯烃合成在查耳酮和黄烷酮合成中的新应用。2-(苯并[ d ]噻唑-2-基磺酰基)-1-苯乙酮已被开发为用于直接朱莉娅- Kocienski烯新试剂在碱的存在下的醛,得到良好的查耳酮以优良的产率。而2-(苯并[ d ]噻唑-2-基磺酰基)-1-(2-羟基苯基)乙酮与芳族醛反应,通过一锅内分子内环化反应以高收率提供黄烷酮。
Synthesis of 3-substituted 1,5-aldehyde estersvia an organocatalytic highly enantioselective conjugate addition of new carbonylmethyl 2-pyridinylsulfone to enals
作者:Jing Deng、Fei Wang、Wenzhong Yan、Jin Zhu、Hualiang Jiang、Wei Wang、Jian Li
DOI:10.1039/c1cc15714k
日期:——
A highlyenantioselectiveorganocatalytic protocol for conjugateaddition of new nucleophilic carbonylmethyl 2-pyridinylsulfone to enals has been developed in good yields and with high enantioselectivities. The resulting Michael adducts are versatile building blocks for a variety of organic transformations.
An asymmetric allylic alkylation of Morita–Baylis–Hillmancarbonates and β-keto sulfones was investigated by the catalysis of modified cinchonaalkaloids, whose products underwent a Smiles rearrangement–sulfinate addition cascade to furnish highly functionalized five-membered cyclic sulfones in moderate to excellent enantioselectivity and good diastereoselectivity after treatment with DBU.