Efficient and Regioselective Synthesis of 5-Hydroxy-2-isoxazolines: Versatile Synthons for Isoxazoles, β-Lactams, and γ-Amino Alcohols
摘要:
An efficient and highly regioselective protocol was developed for the preparation of 5-hydroxy-2-isoxazolines, which have been proved to be versatile synthons for isoxazles, beta-hydroxy oximes, and gamma-amino alcohols. beta-Lactams, commonly embedded in the skeletons of bioactive natural products, were also synthesized in two steps from beta-hydroxy oximes, providing a new strategy for the synthesis of this kind of compounds.
Preparation of α-Sulfonylethanone Oximes from Oxidized Hydroxylamine
作者:Nan Liu、Ping Yin、Yue Chen、Yong Deng、Ling He
DOI:10.1002/ejoc.201200133
日期:2012.5
Alkenes react with substituted N-hydroxysulfonamides and tetrabutylammonium periodate under metal catalyst free conditions to give oximes in good to high yields. The reaction proceeds in a one-pot manner, giving rise to the formation of intermolecular C–N and C–S bonds simultaneously. The method is mild, highly efficient, and convenient.
Diverse<i>N</i>-Heterocyclic Ring Systems via Aza-Heck Cyclizations of<i>N</i>-(Pentafluorobenzoyloxy)sulfonamides
作者:Ian R. Hazelden、Xiaofeng Ma、Thomas Langer、John F. Bower
DOI:10.1002/anie.201605152
日期:2016.9.5
bond of N‐(pentafluoro‐benzoyloxy)sulfonamides are described. These studies, which encompass only the second class of aza‐Heck reaction developed to date, provide direct access to diverse N‐heterocyclicringsystems.
Prodrugs of Nitroxyl and Nitrosobenzene as Cascade Latentiated Inhibitors of Aldehyde Dehydrogenase
作者:Terry T. Conway、Eugene G. DeMaster、Melinda J. C. Lee、Herbert T. Nagasawa
DOI:10.1021/jm980200+
日期:1998.7.1
(7d) groups. It was expected that the bioactivation of these prodrugs would initiate a cascade of nonenzymatic reactionsleading to the ultimate liberation of NB or nitroxyl, thereby inhibiting AlDH. Indeed, the ester pro-prodrugs of both series were highly active in inhibiting yeast AlDH in vitro with IC50 values ranging from 21 to 64 microM. However, only 7d significantly raised ethanol-derived blood
An iodine-mediated new avenue to sulfonylation employing <i>N</i>-hydroxy aryl sulfonamide as a sulfonylating agent
作者:Dushyant Singh Raghuvanshi、Narsingh Verma
DOI:10.1039/d1ob00036e
日期:——
A novel and highly efficient I2/K2CO3 mediated regioselective sulfonylation of thiophenols, aryl acetylenic acid and aromatic alkynes with N-hydroxy sulfonamide has been developed.
Development of Photoactivatable Nitroxyl (HNO) Donors Incorporating the (3‐Hydroxy‐2‐naphthalenyl)methyl Phototrigger
作者:Yang Zhou、Ruth B. Cink、Zachary A. Fejedelem、M. Cather Simpson、Alexander J. Seed、Paul Sampson、Nicola E. Brasch
DOI:10.1002/ejoc.201800092
日期:2018.4.23
family of photoactivatableHNOdonors of general structure RSO2NHO-PT [where PT represents the (3hydroxy-2-naphthalenyl)methyl (3,2-HMN) phototrigger] has been developed, which rapidly releases HNO. Photogeneration of HNO was demonstrated using the vitamin B12 derivative aquacobalamin as a trapping agent. The amount of sulfonate RSO2 produced was essentially the same as the amount of HNO released upon