88701-89-7Relevant academic research and scientific papers
Palladium-catalyzed stereoselective (3 + 2) cycloaddition of vinylethylene carbonates with cyclicN-sulfonyl ketimines
Gao, Xing,Zhu, Dongyu,Jiang, Feng,Liao, Jianning,Wang, Wei,Wu, Yongjun,Zheng, Lufei,Guo, Hongchao
supporting information, p. 4877 - 4881 (2021/06/16)
A diastereoselective (3 + 2) cycloaddition ofN-sulfonyl ketimines with vinylethylene carbonates (VECs) in the presence of Pd2dba3·CHCl3and PPh3has been developed. The reaction of various substituted VECs and diverse cyclicN-sulfonyl ketimines proceeded smoothly under mild conditions, giving highly functionalized oxazolidine frameworks in good to excellent yields with moderate to good diastereoselectivities. With the use of spiroketal-based diphosphine SKP as a chiral ligand, an asymmetric version of the current (3 + 2) cycloaddition was achieved, and chiral products were obtained in >99% ee in most cases.
Reaction of 4-Styryl-1,2,3-benzoxathiazine 2,2-Dioxides with Diazomethane: Synthesis of a Novel Heterocyclic System
Tripathi, Manisha,Dhar, Durga Nath
, p. 1191 - 1192 (2007/10/02)
A new class of heterocyclic system, 3a-f, has been synthesized by reacting diazomethane with 4-styryl-1,2,3-benzoxathiazine 2,2-dioxides 1a-f.Diazomethane adds to the =C=S group of these compounds.
Synthesis of 4-Styryl-1,2,3-benzoxathiazine 2,2-Dioxides, Naphth-1,2,3-oxathiazine 2,2-dioxide and 1,3-Dipolar Cycloaddition of 1,3-Diphenylnitrilimine to 4-Styryl-1,2,3-benzoxathiazine 2,2-Dioxides
Dhar, Durga N.,Bag, Amal K.
, p. 627 - 631 (2007/10/02)
4-Styryl-1,2,3-benzoxathiazine 2,2-dioxide (4a-e) have been synthesized by the reaction of chlorosulphonyl isocyanate with 2'-hydroxychalcone (1a-e). 2-Hydroxy-1-napthaldehyde reacts with chlorosulphonyl isocyanate to give naphth-oxathiazine 2,2-dioxide (9).The 1,3-dipolar cycloaddition of 1,3-diphenylnitrilimine to 4a-e gives the hitherto unreported heterocyclic system (14)
