On the stereoselectivities of some hindered Diels–Alder reactions
作者:Hugh A. Hoather、James Raftery、Irem Yalavac、Eric J. Thomas
DOI:10.1016/j.tet.2015.04.101
日期:2015.6
were the major products isolated from Diels–Alderreactions of (2E,4E)-2,4-dimethylhexa-2,4-dienyl methyl fumarate and maleate and from the cyclisation of the all (E)-2,4,6,8-tetramethyldeca-2,4,6,8-tetraenyl methyl fumarate in contrast to the Diels–Alderreactions of analogous substrates that lack the dienyl 2-methyl group. All of these Diels–Alderreactions led to the introduction of a methyl bearing
Cytochalasan synthesis: synthesis of an [11]-membered ring precursor of cytochalasin H
作者:Eric J. Thomas、John W. F. Whitehead
DOI:10.1039/c39860000724
日期:——
The cytochalasin H precursor (20) has been synthesized using an intramolecularDiels–Alderreaction to control stereochemistry and to form the 11-memberedring.
An approach to cytochalasin D; 11-membered ring formation using an intramolecular Diels–Alder reaction
作者:Andrew Craven、David J. Tapolczay、Eric J. Thomas、John W. F. Whitehead
DOI:10.1039/c39850000145
日期:——
As preparation for a proposed synthesis of cytochalasinD, the triene-pyrrolinone (12) was shown to cyclize stereoselectively on heating (12h, 100 °C) in toluene to give the Diels–Alder product (13)(40–45%), and a synthesis of the protected dihydroxyaldehyde (26) was developed.
Synthesis of cytochalasans using intramolecular Diels–Alder reactions: an alternative approach to cytochalasin D
作者:Eric J. Thomas、John P. Watts
DOI:10.1039/a906414a
日期:——
11-membered ring. The Diels–Alder precursor 24 was prepared in a convergent fashion from the dienyl phosphonate 17, the aldehyde 16 and the pyrrolidinone 21, with phenylselenenylation and oxidative elimination being used to convert the pyrrolidinone 22 into the unstable pyrrolinone 24. The Diels–Alder reaction of the pyrrolinone 24 under high dilution conditions gave the required endo-adduct 25 in a yield