@article { ISI:000330775500021, title = {Gold(I)-catalysed [1,3] O -> C rearrangement of allenyl ethers}, journal = {Chemical Communications}, volume = {50}, number = {17}, year = {2014}, month = {JAN}, pages = {2152-2154}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

A simple and rapid access to the alpha-substituted acryl aldehydes has been provided by developing a gold-catalysed [1,3] rearrangement of the allenyl ethers importantly with a record turnover frequency of 4600 h(-1) (at 0.05 mol\% of the catalyst concentration) in homogeneous gold(I) catalysis.

}, issn = {1359-7345}, doi = {10.1039/c3cc49629e}, author = {Kona, Chandrababu Naidu and Ramana, Chepuri V.} } @article { ISI:000354205600005, title = {Gold(I)-catalyzed hydroindolylation of allenyl ethers}, journal = {Organic \& Biomolecular Chemistry}, volume = {13}, number = {19}, year = {2015}, month = {APR}, pages = {5358-5362}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

The gold(I)-catalyzed reaction/rearrangement of allenyl ethers has been investigated in the presence of indoles. Either hydroindolylation or alkylation of an indole with the pendant group of allenyl ether has been observed. The reaction outcome seems to be decided mainly by the nature of the pendant group of the allenyl ether. Control experiments are indicative of an inner sphere mechanism for the hydroindolylation reaction.

}, issn = {1477-0520}, doi = {10.1039/c5ob00635j}, author = {Kona, Chandrababu Naidu and Shinde, Mahesh H. and Ramana, Chepuri V.} } @article { ISI:000373636800006, title = {Gold(I) catalyzed [1,3] O -> C rearrangement of benzylvinyl ethers}, journal = {Organic Chemistry Frontiers}, volume = {3}, number = {4}, year = {2016}, month = {JAN}, pages = {453-456}, publisher = {CHINESE CHEMICAL SOC}, address = {PO BOX 1-18, NANKANG, TAIPEI 115, TAIWAN}, abstract = {

A simple procedure for the preparation of 3-(hetero) arylpropionaldehydes has been developed employing a gold-catalyzed [1,3]-rearrangement of vinyl ethers. Using this protocol, Canthoxal, an aromatic aldehyde used in perfumery, has been prepared on a gram scale.

}, issn = {2052-4129}, doi = {10.1039/c5qo00397k}, author = {Kona, Chandrababu Naidu and Patil, Mahesh N. and Ramana, Chepuri V.} } @article {47351, title = {Gold-catalysed nitroalkyne cycloisomerization - synthetic utility}, journal = {Chemical Record}, volume = {21}, year = {2021}, month = {DEC}, type = {Article}, abstract = {

The gold-catalysed intramolecular redox cyclization of o-alkynylnitrobenzens documented by Professors Naoki Asao and Yoshinori Yamamoto is an important discovery that has opened two complementary research domains. Advancing this cyclization with other metals as well as developing new methods around the products that result from this reaction is one aspect that has seen growing interest. On the other hand, the idea of generating alpha-oxo gold carbenes via oxygen transfer to alkynes has established another important aspect in gold-catalysis. In this account, we will be dealing with the first aspect, which revolves around the internal redox cyclization of nitroalkynes (trivially called as nitroalkyne cycloisomerization), focusing mainly on the gold-complexes and the synthetic methods developed around it from our group and from other groups, and also providing the details of similar transformations documented with other metals so that the complementary reactivity/diversity of these transformations could be appreciated.

}, keywords = {alpha-Oxo Gold Carbene, Anthranil, Gold-catalysis, Internal Redox Cyclization, Isatogen}, issn = {1527-8999}, doi = {10.1002/tcr.202100111, Early Access Date = JUN 2021}, author = {Dhote, Pawan S. and Halnor, Swapnil V. and Ramana, Chepuri V.} }