Alkane- and arenesulfonyl isocyanates were added to benzocyclopropene across the C–C σ-bond of the three-membered ring, giving 2-sulfonyl-1-isoindolinones. The reaction with C,N-diphenylnitrone afforded a similar cyclization product, 3,4-dihydro-3,4-diphenyl-1H-2,3-benzoxazine. These reactions are considered to proceed through zwitterionic intermediates formed by the fission of the C–C σ-bond of the
KAGABU, SHINZO;INOUE, TATSUO, CHEM. LETT.,(1989) N2, C. 2181-2182
作者:KAGABU, SHINZO、INOUE, TATSUO
DOI:——
日期:——
One-pot synthesis of 2-hydroxymethylindoles <i>via</i> photoredox-catalyzed ketyl–ynamide coupling/1,3-allylic alcohol transposition
作者:Ze-Shu Wang、Yang-Bo Chen、Kun Wang、Zhou Xu、Long-Wu Ye
DOI:10.1039/d0gc01522a
日期:——
An efficient photoredox-catalyzed ketyl–ynamide coupling of alkyl sulfonyl substituted ynamides followed by 1,3-allylic alcohol transposition in one-pot has been developed, affording 2-hydroxymethylindoles in generally moderate to good yields.
Stereodivergent Synthesis of Spiroaminals via Chiral Bifunctional Hydrogen Bonding Organocatalysis
作者:Prasenjit Gayen、Suman Sar、Prasanta Ghorai
DOI:10.1002/anie.202404106
日期:——
Herein, we accomplished the first stereodivergent construction of spiroaminals via chiral bifunctional organocatalyzed intramolecular 1,2-addition followed by an oxa-Michael addition cascade in a high atom and step economical pathway. A proper modulation of the cinchona-derived squaramide catalysts efficiently provided access to all the stereoisomers with high yield, diastereoselectivity, and excellent