Highly diastereoselective spiro-cyclopropanation of 2-arylidene-1,3-indanediones and dimethylsulfonium ylides
作者:Jie Huang、Shaofa Sun、Ping Ma、Jian Wang、Kevin Lee、Yalan Xing、Yang Wu、Gangqiang Wang
DOI:10.1039/d1nj02886c
日期:——
This efficient and simple protocol features simple operations, mild conditions and excellent functional group compatibility. A variety of structurally interesting spiro-cyclopropanes were prepared in excellent yields and diastereomeric ratios (up to 97% yield and 20 : 1 dr). Also, ring expansion of the cyclopropanation product to quickly deliver a complex indeno[1,2-c]pyridazine structure showcased
2-亚芳基-1,3-茚二酮和二甲基锍叶立德的高度非对映选择性螺环丙烷化反应已通过碱诱导环化开发。这种高效简单的方案具有操作简单、条件温和、功能组兼容性好等特点。以优异的产率和非对映体比率(高达 97% 的产率和 20:1 dr)制备了各种结构有趣的螺环丙烷。此外,环丙烷化产物的扩环以快速提供复杂的茚并[1,2- c ]哒嗪结构展示了该方法的有趣应用。
An efficient synthesis of 2-isoxazolines from α-haloketone oximes and dimethyl sulfonium salts
作者:Sen Zhao、Hang Wang、Shaofa Sun、Haibing Guo、Zhiyu Chen、Jian Wang、Lu Wang、Steven Liang、Gangqiang Wang
DOI:10.1016/j.tetlet.2018.12.062
日期:2019.1
2-Isoxazolines were synthesized efficiently from a formal [4+1] cycloaddition of nitrosoalkenes and sulfurylides, which were generated in situ from α-haloketone oximes and dimethyl sulfonium salts. This approach provides a new method to synthesize a range of 2-isoxazolines in high yields and high regioselectivity.
Amine-catalyzed formal (3 + 3) annulations of 2-(acetoxymethyl)buta-2,3-dienoate with sulfur ylides: synthesis of 4H-pyrans bearing a vinyl sulfide group
作者:Kun Li、Jian Hu、Hui Liu、Xiaofeng Tong
DOI:10.1039/c2cc30242j
日期:——
A DABCO-catalyzed (3 + 3) annulation between 2-(acetoxymethyl)buta-2,3-dienoate and sulfur ylides has been developed, which provides a facile method for the synthesis of 4H-pyrans bearing a vinyl sulfide group.
A highly diastereoselective cyclopropanation of α,β,γ,δ‐unsaturated pyrazolones is reported. This method affords a vinylcyclopropane‐fused pyrazolone framework by a 1,6‐addition/substitution sequence providing excellent regio‐ and chemoselectivity, good yields, broad functional group tolerance and gram‐scale capacity.
An Improved Stereoselective Synthesis of 5-Acyl-2-amino-4-aryl-3-cyano-4,5-dihydrothiophenes
作者:Aleksandr V. Samet、Anatolij M. Shestopalov、Vladimir N. Nesterov、Victor V. Semenov
DOI:10.1055/s-1997-1396
日期:1997.6
Sulfonium ylides generated from precursor bromides 2 react readily with arylidenecyanothioacetamides 1 to afford the title compounds with trans-configuration.