882687-80-1Relevant articles and documents
Iodine-promoted Prins-cyclization of ketones - A facile synthesis of spirocyclic-4-iodotetrahydropyrans and 5,6-dihydro-2H-pyrans
Yadav,Reddy, B. V. Subba,Krishna, V. Hari,Swamy,Kumar, G. G. K. S. Narayana
, p. 412 - 415 (2007)
Homoallylic and homopropargylic alcohols undergo smooth coupling with ketones in the presence of molecular iodine at ambient temperature to produce spirocyclic-4-iodotetrahydropyrans and 5,6-dihydro-2H-pyrans, respectively, in high yields in a short reaction time with high selectivity. The use of molecular iodine makes this procedure quite simple, more convenient, and cost-effective.
Modulation of Prins Cyclization by Vibrational Strong Coupling
Hirai, Kenji,Hutchison, James A.,Takeda, Rie,Uji-i, Hiroshi
, p. 5332 - 5335 (2020)
Light-molecule strong coupling has emerged within the last decade as a new method to control chemical reactions. A few years ago it was discovered that chemical reactivity could be altered by vibrational strong coupling (VSC). Only a limited number of reactions have been investigated under VSC to date, including solvolysis and deprotection reactions. Here the effect of VSC on a series of aldehydes and ketones undergoing Prins cyclization, an important synthetic step in pharmaceutical chemistry, is investigated. A decrease of the second-order rate constant with VSC of the reactant carbonyl stretching groups is observed. We also observe an increased activation energy due to VSC, but proportional changes in activation enthalpy and entropy, suggesting no substantive change in reaction pathway. The addition of common cycloaddition reactions to the stable of VSC-modified chemical reactions is another step towards establishing VSC as a genuine tool for synthetic chemistry.
TMSI mediated Prins-type cyclization of ketones with homoallylic and homopropargylic alcohol: Synthesis of 2,2-disubstituted-, spirocyclic-4-iodo- tetrahydropyrans and 5,6-dihydro-2H-pyrans
Sabitha, Gowravaram,Reddy, K. Bhaskar,Bhikshapathi,Yadav
, p. 2807 - 2810 (2006)
The Prins-type cyclization of ketones with homoallylic and homopropargylic alcohols in the presence of TMSI generated in situ from TMSCl and NaI produced 2,2-disubstituted- or spirocyclic-4-iodo-tetrahydropyrans and spirocyclic-4-iodo-5,6-dihydro-2H-pyran