Phosphine-Catalyzed (3 + 2)/(3 + 2) Sequential Annulation of γ-Vinyl Allenoates: Access to Fused Carbocycles
作者:Jiaxu Feng、Yingying Chen、Wenhui Qin、You Huang
DOI:10.1021/acs.orglett.9b04176
日期:2020.1.17
The first (3 + 2)/(3 + 2) sequential annulation of γ-vinyl allenoates with alkylidenemalononitriles enabled by phosphine catalysis has been reported. A broad range of structurally dense tetra- and penta-substituted bicyclic[3,3,0]octene derivatives, containing a quaternary center and three sequential stereogenic center, were synthesized in good to excellent yields. In this approach, three new C-C bonds
Ylidenemalononitrile Enamines as Fluorescent “Turn-On” Indicators for Primary Amines
作者:Ashley R. Longstreet、Minyoung Jo、Rebecca R. Chandler、Kenneth Hanson、Naiqian Zhan、Jeremy J. Hrudka、Hedi Mattoussi、Michael Shatruk、D. Tyler McQuade
DOI:10.1021/ja509058u
日期:2014.11.5
Ylidenemalononitrile enamines undergo rapid amine exchange followed by a cyclization with primary amines to yield fluorescent products with emission intensities as high as 900 times greater than the starting materials. After identifying the fluorescent species by X-ray crystallography, we demonstrate that the rate of amine exchange is substrate dependent and that by simple structural variation the
Ylidenemalononitrile enamines 进行快速胺交换,然后与伯胺环化产生荧光产物,其发射强度高达起始材料的 900 倍。通过 X 射线晶体学识别荧光物质后,我们证明胺交换的速率取决于底物,并且通过简单的结构变化可以在整个可见光谱范围内调整荧光。我们进一步证明了它们在生物分子标记中的潜在应用。