The high pressure mediated intramolecular diels-alder reaction of furans: Factors controlling cycloaddition with monoactivated dienophiles.
作者:Laurence M. Harwood、Sarah A. Leeming、Neil S. Isaacs、Geraint Jones、John Pickard、Royston M. Thomas、David Watkin
DOI:10.1016/s0040-4039(00)80668-1
日期:1988.1
The Intramolecular Diels-Alderreactions of furans possessing a 2-alkyl substituent with a terminal α,β-unsaturated ketone have been surveyed. The consequences of varying the degree of substitution of the furan, the bridging chain length, and position of the activating group on the dienophile upon the ease and stereochemistry of cycloaddition are reported.
Intramolecular diels-alder reaction with furan-diene. A novel potential entry to steroids.
作者:Luc A. Van Royen、Roelant Mijngheer、Pierre J. De Clercq
DOI:10.1016/s0040-4039(00)87593-0
日期:1982.1
Depending on the reaction conditions the intramolecular Diels-Alder reaction of furan-diene yields predominantly either one of two adducts and , which possess the necessary functionality for eventual transformation into corticosteroids. The dienophile was introduced via alkylation of the enolate, formally obtained upon lithium-liq. ammonia reduction of 3-furyl-2-methyl-2-cyclopentenone ().
Intramolecular Diels–Alder reaction of the diene unit of furan in 2.0<scp>M</scp>CaCl<sub>2</sub>
作者:Brian A. Keay
DOI:10.1039/c39870000419
日期:——
The intramolecularDiels–Alderreaction of substituted 6-(2-furyl)hex-1-en-3-ones (1)–(6) in 2.0M calcium chloride provides 11-oxatricyclo[6.2.1.01,6]undec-9-en-5-ones (7)–(12) in moderate to good yield.
High pressure intramolecular Diels-Alder reactions of the furan diene
作者:Brian A. Keay、Peter W. Dibble
DOI:10.1016/s0040-4039(01)80354-3
日期:1989.1
A variety of substituted furans (-) undergo the intramolecular Diels-Alderreaction at highpressure (12.5 kbar) to provide oxatricyclo adducts (-) within 24 hours at room temperature.