In order to get further information on the effect of terminal groups on the spectral regularity of diarylpoly-ynes, we carried out the syntheses of bis(4-biphenylyl)poly-ynes (In, n=1–6) and 2,2′-difluorenylpoly-ynes (IIn, n=1–4 and 6). The bathochromic shift of the longest-wavelength absorption maxima (λL) along with the increase in n was found to be expressed by the following empirical formulas:In:λL=24
Reactivity of indole-3-alkoxides in the absence of acids: Rapid synthesis of homo-bisindolylmethanes
作者:Bhavani Shankar Chinta、Beeraiah Baire
DOI:10.1016/j.tet.2016.10.067
日期:2016.12
properties of the alkoxides offered the direct and selective construction of bisindolylmethanes and indole-3-carbinols. This process shows very broad scope and represents the reagent (external) free, greener synthesis of structurally divergent bisindolylmethanes.
Synthesis of Chiral Propargylamines, Chiral 1,2‐Dihydronaphtho[2,1‐b]furans and Naphtho[2,1‐b]furans with C‐Alkynyl N,N′‐di‐(tert‐butoxycarbonyl)‐aminals and β‐Naphthols
作者:Ningning Man、Yuming Li、Jiyang Jie、Hongyun Li、Haijun Yang、Yufen Zhao、Hua Fu
DOI:10.1002/chem.202102040
日期:2021.9.6
phosphoric acid-catalyzed in situ formation of N-(tert-butoxycarbonyl)-imines (N-Boc-imines) from the aminals, and 1,2-addition of β-naphthols to the N-Boc-imines. Chiral 1,2-dihydronaphtho[2,1-b]furans and naphtho[2,1-b]furans were prepared with satisfactory results when 10 mol% AgOAc and 20 mol% 2,6-lutidine or 1.2 equiv. of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) were added to the resulting chiral propargylamines
Ag-Catalyzed Insertion of Alkynyl Carbenes into C–C Bonds of β-Ketocarbonyls: A Formal C(sp<sup>2</sup>) Insertion
作者:Yongquan Ning、Qingmin Song、Paramasivam Sivaguru、Lizuo Wu、Edward A. Anderson、Xihe Bi
DOI:10.1021/acs.orglett.1c04081
日期:2022.1.21
Here we report a silver-catalyzed alkynyl carbene insertion into β-ketocarbonyls using alkynyl N-nosylhydrazones as alkynyl carbene precursors, which provides access to trisubstituted allenyl ketones. This reaction represents the first example of an alkynyl carbene insertion into a C–C σ bond, affording products homologated with an sp2 carbon center. The products are useful substrates for further transformations
Enantioselective decarboxylative Mannich reaction of β-keto acids with <i>C</i>-alkynyl <i>N</i>-Boc <i>N</i>,<i>O</i>-acetals: access to chiral β-keto propargylamines
作者:Cong-Cong Zhang、Li-Jun Chen、Bao-Chun Shen、Hui-Ding Xie、Wei Li、Zhong-Wen Sun
DOI:10.1039/d1ob01555a
日期:——
related synthetic approaches remain limited. Therefore, a concise and efficient method for the enantioselective synthesis of β-keto propargylamines via chiral phosphoric acid-catalyzed asymmetric Mannichreaction between β-keto acids and C-alkynyl N-Boc N,O-acetals as easily available C-alkynyl imine precursors has been demonstrated here, affording a broad scope of β-keto N-Boc-propargylamines in high
手性酮基取代的炔丙基胺是有机和药物合成领域必不可少的一类多功能化合物,受到了广泛关注,但相关的合成方法仍然有限。因此,通过手性磷酸催化 β-酮酸与C-炔基 N - Boc N , O-缩醛作为容易获得的C-炔基亚胺前体的不对称曼尼希反应,一种简洁有效的对映选择性合成 β-酮炔丙基胺的方法这里已经证明,提供广泛的 β-酮N-Boc-炔丙基胺具有高产率(高达 97%),通常具有高对映选择性(高达 97 : 3 er)。