A five fused ring non-benzenoid quinone containing a seven-membered ring: synthesis and properties of cyclohept[f,g]aceanthrylene-5,8-dione and 1,2-dihydrocyclohept[f,g]aceanthrylene-5,8-dione

1994 ◽  
pp. 1215 ◽  
Author(s):  
Kiyokazu Morita ◽  
Takashi Aida ◽  
Kennichi Morinaga ◽  
Josuke Tsunetsugu
Keyword(s):  
Membered Ring ◽  
Fused Ring ◽  
Ring Synthesis

ChemInform Abstract: A Surprising Eight-Membered Ring Synthesis Leading To Enantiomerically Pure Tricyclic Benzodiazepine Derivatives.

ChemInform ◽  
2010 ◽  
Vol 26 (29) ◽  
pp. no-no
Author(s):  
A. HAKIKI ◽  
M. MOSSADAK ◽  
M. MOKHLES ◽  
F. ROUESSAC ◽  
H. DUDDECK ◽  
...  
Keyword(s):  
Membered Ring ◽  
Enantiomerically Pure ◽  
Benzodiazepine Derivatives ◽  
Ring Synthesis

scholarly journals New diterpenoid quinones derived from Salvia miltiorrhiza and their cytotoxic and neuroprotective activities

RSC Advances ◽  
2020 ◽  
Vol 10 (24) ◽  
pp. 14235-14242
Author(s):  
Zhao-Kun Yin ◽  
Zi-Ming Feng ◽  
Jian-Shuang Jiang ◽  
Xu Zhang ◽  
Pei-Cheng Zhang ◽  
...  
Keyword(s):  
Salvia Miltiorrhiza ◽  
Membered Ring ◽  
Ring Compounds ◽  
Fused Ring

A new tanshinone derivative, which possesses an unusual 6/6/5/6 fused-ring skeleton together with 4 new five-membered lactone benzohexa-membered ring compounds and 3 new carboxyl substituted 5,5-spiroketal compounds, were isolated from dried rhizomes of Salvia miltiorrhiza.

Chiral Mo−Binol Complexes:  Activity, Synthesis, and Structure. Efficient Enantioselective Six-Membered Ring Synthesis through Catalytic Metathesis

1999 ◽  
Vol 121 (36) ◽  
pp. 8251-8259 ◽  
Author(s):  
S. Sherry Zhu ◽  
Dustin R. Cefalo ◽  
Daniel S. La ◽  
Jennifer Y. Jamieson ◽  
William M. Davis ◽  
...  
Keyword(s):  
Membered Ring ◽  
Ring Synthesis

The mechanism investigation of the imidazolidinone catalyzed five-membered ring synthesis reaction

2012 ◽  
Vol 26 (3) ◽  
pp. 232-239 ◽  
Author(s):  
Lili Zhang ◽  
Huiling Liu ◽  
Yuhong Yang ◽  
Zhihui Chong ◽  
Tingting Feng ◽  
...  
Keyword(s):  
Membered Ring ◽  
Synthesis Reaction ◽  
Ring Synthesis

ChemInform Abstract: Highly Stereoselective 7-Membered Ring Synthesis Based upon the Oxidopyrylium-Alkene [5 + 2] Cycloaddition Reaction.

ChemInform ◽  
2010 ◽  
Vol 33 (6) ◽  
pp. no-no
Author(s):  
Naoki Ohmori ◽  
Toru Miyazaki ◽  
Satoshi Kojima ◽  
Katsuo Ohkata
Keyword(s):  
Cycloaddition Reaction ◽  
Membered Ring ◽  
Ring Synthesis

Activated cycloheptenone dienophiles. A versatile approach to 6,7-fused ring targets

1995 ◽  
Vol 73 (7) ◽  
pp. 1135-1147 ◽  
Author(s):  
Hsing-Jang Liu ◽  
Wen-Lung Yeh ◽  
Eric N.C. Browne
Keyword(s):  
Natural Products ◽  
Alder Reaction ◽  
Ring System ◽  
Membered Ring ◽  
Diels Alder ◽  
Substitution Pattern ◽  
Diels Alder Reaction ◽  
Fused Ring ◽  
Fused Ring System

Several 2-carbalkoxy-2-cyclohepten-1-ones were prepared and their Diels–Alder characteristics examined in order to develop a facile general approach to the synthesis of cycloheptane ring-containing polycyclic natural products. Substitution pattern on the seven-membered ring was found to greatly affect the Diels–Alder behavior. In addition, some extraordinary facial stereoselectivity was observed. Keywords: Diels–Alder reaction, 2-carbalkoxy-2-cyclohepten-1-ones, 6,7-fused ring system.

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