933463-36-6Relevant academic research and scientific papers
Synthesis of partially reduced ferrocenylphenanthrenes from 2-oxobenzo[h]chromenes through C-C insertion
Pratap, Ramendra,Ram, Vishnu Ji
, p. 394 - 396 (2008)
An efficient and concise de novo synthesis of ferrocenyl tethered partially reduced phenanthrenes is described through base-catalyzed ring transformation of 4-sec-amino-2-oxo-5,6-dihydro-2H-benzo[h]chromene-3-carbonitriles with acetylferrocene.
Synthesis of Highly Functionalized Spirobutenolides via a Nitroalkane-Mediated Ring Contraction of 2-Oxobenzo[ h]chromenes through Denitration
Elagamy, Amr,Shaw, Ranjay,Panwar, Rahul,Shally,Ram, Vishnu Ji,Pratap, Ramendra
, p. 1154 - 1161 (2019)
A facile synthesis of highly functionalized spirobutenolides was carried out by a nitroalkane carbanion-induced ring opening and relactonization via a denitration reaction of 2-oxo-5,6-dihydro-2H-benzo[h]chromene-3-carbonitriles and 2-oxo-2,5-dihydrothioc
Step-wise and one-pot synthesis of highly substituted conjugated trienes from 2-oxobenzo[h]chromenes/2H-pyran-2-ones
Elagamy, Amr,Althagafi, Ismail,Pratap, Ramendra
supporting information, p. 3901 - 3910 (2021/05/14)
A mild and efficient route for the synthesis of conjugated trienesvianitroethane-mediated ring contraction of 2-oxobenzo[h]chromenes/2H-pyran-2-ones followed by decarboxylative rearrangement of the obtained spirobutenolides and butenolides is described. The (E)-isomer of trienes was obtained by step-wise and one-pot approaches from 2-oxobenzo[h]chromenes. Butenolides4a-las new substrates have been developed for the construction of trienes. The mixture of the (E)- and (Z)-isomers of spirobutenolides undergoes decarboxylative rearrangement in the presence of sodium ethoxide as a base to yield the (E)-isomer of trienes, while the (E)-isomer of butenolides reacts to give a mixture of (2E,4E)- and (2E,4Z)-isomers of trienes in an almost steady ratio of 45?:?55 or 1?:?1.2. The structure and geometry of the obtained butenolides and trienes were confirmed by single-crystal X-ray analysis.
A convenient synthesis of partially reduced benzo[c]phenanthrenes, its ketals and ketones
Pratap, Ramendra,Raghunandan, Resmi,Mishra, Abhishek Kumar,Maulik,Gupta,Ram, Vishnu Ji
scheme or table, p. 1458 - 1464 (2010/04/02)
A concise and convenient synthesis of various partially reduced 6-sec-amino-1,2,3,4,7,8-hexahydro-, 6-sec-amino-1,2,7,8-tetrahydrobenzo[c]phenanthrene-5-carbonitriles, 6-sec-amino-3,4,7,8-tetrahydro-1H-benzo[c]phenanthrene-2-one-5-carbonitrile cycloalkene
An expeditious protocol for sesquiterpene-cored functionalized arenes from S-(-)-citronellal
Goel, Atul,Verma, Deepti
body text, p. 2086 - 2089 (2009/09/06)
An expeditious straightforward synthesis of sesquiterpene-cored arenes functionalized with electron-withdrawing or electron-donating substituents is described and illustrated by Michael addition of S-(-)-citronellal on functionalized 2H-pyran-2-one in a s
Economical synthesis of novel class of heteroatom containing partially reduced polycyclic aromatic hydrocarbons
Pratap, Ramendra,Ram, Vishnu Ji
scheme or table, p. 2805 - 2807 (2009/09/30)
An efficient and convenient synthesis of 2-oxa- and 2-thia-3,4,7,8-tetrahydro-1H-benzo[c]phenanthrenes has been described through base-induced ring transformation of 2-oxo-4-sec.amino-5,6-dihydro-2H-benzo[h]chromene-3-carbonitriles by 4-oxotetrahydropyran
An efficient non-catalytic, regioselective approach to the synthesis of angularly fused polycyclic systems
Pratap, Ramendra,Ram, Vishnu Ji
scheme or table, p. 4239 - 4242 (2009/10/26)
A novel approach to the synthesis of partially reduced different ring sizes of PAH analogs with sec.amino and nitrile functionalities is delineated through base-induced ring transformation of 4-sec.amino-2-oxo-5,6-dihydro-2H-benzo[h]chromene-3-carbonitril
A non-catalytic approach to the synthesis of 5,6-dihydrobenzo[h]quinolines
Pratap, Ramendra,Ram, Vishnu Ji
, p. 2755 - 2759 (2008/02/03)
A concise synthesis of highly functionalized 5,6-dihydrobenzo[h]quinoline-3-carbonitriles is delineated through base induced ring transformation of 4-sec-amino-2-oxo-5,6-dihydro-2H-benzo[h]chromene-3-carbonitriles with S-methylisothiourea sulfate and 1-ca
An efficient and versatile route to the synthesis of 9,10-dihydro-3-formylphenanthrenes
Pratap, Ramendra,Ram, Vishnu Ji
, p. 1715 - 1719 (2008/02/05)
An innovative and efficient route to the synthesis of 9,10-dihydro-3-formylphenanthrenes 7 has been delineated through the ring transformation of 2-oxo-4-sec-amino-5,6-dihydro-2H-benzo[h]chromene-3-carbonitriles 4 with methyl glyoxaldimethylacetal 5 to ma
2-Oxobenzo[h]chromene: a novel entry for the concise and efficient synthesis of indeno[1,2-c]phenanthrenes
Pratap, Ramendra,Ram, Vishnu Ji
, p. 4379 - 4382 (2008/02/04)
An efficient and concise synthesis of 7-sec-amino-5,13-dihydro-6H-indeno[1,2-c]phenanthrene-8-carbonitriles is described through base catalyzed ring transformation of 4-sec-amino-2-oxo-5,6-dihydro-2H-benzo[h]chromene-3-carbonitriles with 1-indanone in mod
