作者:Isuru Dissanayake、Jacob D. Hart、Emma C. Becroft、Christopher J. Sumby、Christopher G. Newton
DOI:10.1021/jacs.0c06306
日期:2020.8.5
5-Bis(tert-butyldimethylsilyloxy)furans are established as vicinal bisketene equivalents for application as dienes in the Diels-Alderreaction. Cycloaddition with olefinic dienophiles, under exceptionally mild conditions, enables convergent access to highly substituted para-hydroquinones in unprotected form via a one-pot Diels-Alder/ring-opening/tautomerization sequence. The synthesis of para-benzoquinones from
A highly enantioselective, quinoneDiels-Alderreaction catalyzed by chiral samarium and gadolinium pyridyl-bis(oxazoline) (pybox) complexes has been developed. The reaction scope has been extended to include three quinones and five dienes, all of which exclusively provide the expected endo product in excellent yields and enantioselectivities.
The chemistry of fungi. Part LXI. The synthesis of (±)-sclerotiorin, of (±)-4,6-dimethylocta-trans-2,trans-4-dienoic acid, and of an analogue of rotiorin
作者:R. Chong、R. R. King、W. B. Whalley
DOI:10.1039/j39710003566
日期:——
Syntheses of (±)-sclerotiorin, the principal pigment of several fungi including Penicillium multicolor and P. sclerotiorum, of (±)-4,6-dimethylocta-trans-2,trans-4-dienoic acid [a major degradation product of (+)- and of (–)-sclerotiorin] and of (+)-5-chloroisorotiorin, an angular analogue of rotiorin, are described.