alkyl 4-amino-3-aryl-1-methyl-5-(trifluoromethyl)-1H-pyrrole-2-carboxylates via methylation/hydrazinolysis. 1-(3,3,3-Trifluoro-2,2-dihydroxypropyl)pyridin-1-ium bromide serves as a trifluoromethyl-containingbuildingblock for the preparation of trifluoromethyl-substituted aminopyrroles based on the 2H-azirine ring expansion strategy. The primary products, 3-aryl-2-(methoxycarbonyl)-4-(pyridin-1-ium
Organocatalyzed nucleophilic addition of pyrazoles to 2H-azirines: asymmetric synthesis of 3,3-disubstituted aziridines and kinetic resolution of racemic 2H-azirines
The first organocatalytic asymmetricnucleophilicaddition of arylpyrazoles to 2H-azirines and kinetic resolution of racemic 2H-azirines have been realized. Chiral aziridines were obtained with up to 98% yields and up...
An isoxazole strategy for the synthesis of alkyl 5-amino-4-cyano-1<i>H</i>-pyrrole-2-carboxylates – versatile building blocks for assembling pyrrolo-fused heterocycles
作者:Anastasiya V. Agafonova、Liya D. Funt、Mikhail S. Novikov、Alexander F. Khlebnikov
DOI:10.1039/d1ob00053e
日期:——
malononitrile under Fe(II) catalysis. Alkyl 5-amino-4-cyano-1H-pyrrole-2-carboxylates are excellent building blocks for various annulation reactions, leading to new derivatives of 1H-pyrrolo[1,2-a]imidazole and pyrrolo[2,3-d]pyrimidine. The DFT calculations of mechanistic details of alkyl 5-amino-4-cyano-1H-pyrrole-2-carboxylate formation are presented.
已经开发了一种完全原子经济的多米诺骨牌方法,该方法通过在Fe(II)催化下,将5烷氧基异恶唑与丙二腈进行反硝化来制备5-氨基-4-氰基-1 H-吡咯-2-羧酸烷基酯。5-氨基-4-氰基-1 H-吡咯-2-羧酸烷基酯是各种环化反应的极好基石,从而导致了1 H-吡咯并[1,2- a ]咪唑和吡咯并[2,3-的新衍生物d ]嘧啶。提出了5-氨基-4-氰基-1 H-吡咯-2-羧酸烷基酯形成机理的DFT计算方法。
A new hypervalent iodine(<scp>iii</scp>/<scp>v</scp>) oxidant and its application to the synthesis of 2<i>H</i>-azirines
作者:Guangtao Zhang、Yuanxun Wang、Jun Xu、Jiyun Sun、Fengxia Sun、Yilin Zhang、Chenglin Zhang、Yunfei Du
DOI:10.1039/c9sc05536c
日期:——
in acetic acid was found to afford a novel hypervalentiodine compound, in the structure of which both iodine(III) and iodine(V) moieties coexist. The nitro groups at the ortho phenyl positions were found to be crucial in stabilizing this uncommon structure. This novel hypervalentiodine(III/V) oxidant is proved to be effective in realizing the synthesis of 2-unsubstitued 2H-azirines via intramolecular
邻硝基碘苯与间CPBA 在乙酸中反应可得到一种新型高价碘化合物,其结构中碘 ( III ) 和碘 ( V ) 部分共存。人们发现邻苯基位置的硝基对于稳定这种不常见的结构至关重要。这种新型高价碘( III / V )氧化剂被证明可以有效地实现通过分子内氧化氮丙啶合成2-未取代的2H-氮丙啶,这是现有已知的高价碘试剂无法有效实现的。