One-Pot Multistep Bohlmann−Rahtz Heteroannulation Reactions: Synthesis of Dimethyl Sulfomycinamate
摘要:
The synthesis of dimethyl sulfomycinamate, the acidic methanolysis product of the sulfomycin family of thiopeptide antibiotics, from methyl 2-oxo-4-(trimethylsilyl)but-3-ynoate is achieved in a 2,3,6-trisubstituted pyridine synthesis that proceeds with total regiocontrol in 13 steps by the Bohlmann-Rahtz heteroannulation of a 1-(oxazol-4-yl)enamine or in 12 steps and 9% yield by three-component cyclocondensation with N-[3-oxo-3-(oxazol-4-yl)propanoyl]serine and ammonia in ethanol.
[EN] ISOINDOLINE DERIVATIVES FOR USE IN THE TREATMENT OF A VIRAL INFECTION<br/>[FR] DÉRIVÉS D'ISOINDOLINE À UTILISER DANS LE TRAITEMENT D'UNE INFECTION VIRALE
申请人:VIIV HEALTHCARE UK LTD
公开号:WO2016005878A1
公开(公告)日:2016-01-14
Compounds of Formula I are disclosed and methods of treating viral infections with compositions comprising such compounds (Formula I)
化合物I的结构已经公开,并且揭示了使用含有这些化合物(结构I)的组合物治疗病毒感染的方法。
Asymmetric Hetero-Diels-Alder Reaction of Danishefsky’s Diene with α-Ketoesters and Isatins Catalyzed by a Chiral<i>N</i>,<i>N′</i>-Dioxide/Magnesium(II) Complex
A highly enantioselective hetero‐Diels–Alder reaction of Danishefsky’s diene with α‐ketoesters and isatins has been realized by using a chiral N,N′‐dioxide/MgII complex. In the presence of only 0.1–0.5 mol % catalyst, a series of substrates were transformed into the corresponding tetrasubstituted 2,3‐dihydropyran‐4‐ones in up to 99 % yield and more than 99 % ee in two hours.
Chiral iminophosphorane catalyzed asymmetric Henry reaction of α,β-alkynyl ketoesters
作者:Yanxia Zhang、Xin-Yan Wu、Jianwei Han
DOI:10.1016/j.cclet.2019.04.042
日期:2019.8
Abstract α,β-Alkynyl ketoesters were introduced to the enantioselective Henry reaction (nitroaldol condensation) with nitromethane catalyzed by tartaric acid derived chiral iminophosphoranes. As such, a variety of optically active β-nitro-substituted tertiary alcohols bearing alkyne moieties were obtained in good to excellent yields (42%–99%) and moderate to good level of enantiomeric excess (up to
A new mild method for the one-pot synthesis of pyridines
作者:Xin Xiong、Mark C Bagley、Krishna Chapaneri
DOI:10.1016/j.tetlet.2004.06.061
日期:2004.8
Polysubstituted pyridines are prepared in good yield and with total regiocontrol by the one-pot reaction of an alkynone, 1,3-dicarbonyl compound and ammonium acetate in alcoholic solvents. This new three-component heteroannulation reaction proceeds under mild conditions in the absence of an additional acid catalyst and has been used in the synthesis of dimethyl sulfomycinamate, the acidic methanolysis
Alkynylhydrazones are synthesized conveniently from 2-oxo-3-butynoates and hydrazine by suppressing the susceptible formation of pyrazoles. The resultant hydrazones are transformed into alkynyl diazoacetates under metal-free and mild oxidative conditions in excellent yields. Further, the alkynyl cyclopropane and propargyl silane carboxylates are synthesized in good yields by developing an unprecedented