Cumulene photochemistry: photorearrangments of tetraphenyl and triphenyl C3 isomers
作者:Michael W. Klett、Richard P. Johnson
DOI:10.1021/ja00299a036
日期:1985.6
Photoreactions dans des solvants aprotiques du tetraphenylallene, du triphenylallene, des triphenyl-1,2,3- et -1,3,3-cyclopropenes. Description des isomeres de l'indene diversement substitues figurant parmi les photoproduits. Mecanisme
光反应 dans des solvants aprotiques du tetraphenylallene, du triphenylallen, des triphenyl-1,2,3- et -1,3,3-cyclopropenes。描述 des isomeres de l'indene 多样性替代 figurant parmi les photoproduits。机制
Synthesis of Acrylonitriles through an FeCl<sub>3</sub>-Catalyzed Domino Propargylic Substitution/Aza-Meyer-Schuster Rearrangement Sequence
Nontoxic cyanide source: An unprecedented route to acrylonitriles by employing propargylic alcohols and para‐tolylsulfonohydrazide as a combined cyanosource has been developed (see scheme). This efficient and practical cyanation reaction proceeds through an FeCl3‐catalyzed domino propargylic substitution/aza‐Meyer–Schuster rearrangement sequence, the rearrangement process of which is reported for
An iodine(III)-catalyzed general method for the synthesis of fully functionalized NH-pyrazoles and isoxazoles from α,β-unsaturated hydrazones and oximes, respectively, via cyclization/1,2-aryl shift/aromatization/detosylation, has been developed. The reaction progresses through an anti-Baldwin 5-endo-trig cyclization. It gives direct access to an advanced intermediate for the preparation of valdecoxib
Synthesis of Allenyl Sulfones via a TBHP/TBAI-Mediated Reaction of Propargyl Alcohols with Sulfonyl Hydrazides
作者:Zheng Yang、Wen-Juan Hao、Shu-Liang Wang、Jin-Peng Zhang、Bo Jiang、Guigen Li、Shu-Jiang Tu
DOI:10.1021/acs.joc.5b01684
日期:2015.9.18
A new TBHP/TBAI-mediated reaction of propargyl alcohols with sulfonyl hydrazides in the presence of HOAc has been established, in which a wide variety of allenyl sulfones were obtained in moderate to excellent yields. Mechanistic studies indicate that this transformation involves HOAc-promoted sulfonohydrazide intermediate formation, sequential C-O, C-N, and N-S bond cleavage, and C-S bond formation. Significantly, this sulfonohylation proceeds in a radical process and shows highly functional group compatibility and excellent regioselectivity, with a short reaction time and inexpensive reagents.
Duerr,H., Chemische Berichte, 1970, vol. 103, p. 369 - 379