A Domino Amidation Route to Indolines and Indoles: Rapid Syntheses of Anhydrolycorinone, Hippadine, Oxoassoanine, and Pratosine
摘要:
When subjected to palladium-catalyzed amidation conditions, 2-triflyloxy phenethyl carbonates undergo, in addition to the expected aryl cross-coupling, an additional amidation with net displacement of the carbonate. The result is a one-step synthesis of indolines which may be oxidized to indoles. The utility of the procedure is illustrated by the two- or three-step syntheses of anhydrolycorinone, hippadine, oxoassoanine, and pratosine.
三氟乙酸和其他布朗斯台德酸催化的10-烯丙基-2-氧代-Δ1 (9),3-六氢萘(12)的重排几乎只产生了[3 s,3 s ]产物1-和3- 5,6,7,8-四氢-2-萘烯丙基(分别为16和15)。用三氟乙酸酐或乙酸酐/硫酸对12进行重排,除15和16外,还会产生可观数量的[1 s,2 s ]重排产物4-烯丙基5,6,7,8-四氢- 2-萘酚(14)(表1)。
Thiophenol-mediated intramolecular radical cyclization: an efficient method for the synthesis of benzoxocine derivatives
作者:Krishna C. Majumdar、K. Ray、P. Debnath、P.K. Maji、N. Kundu
DOI:10.1016/j.tetlet.2008.07.030
日期:2008.9
A new, efficient, high yielding method for the synthesis of benzoxocine derivatives has been developed via a thiophenol-mediated intramolecular 8-endo radicalcyclization. This method allowed the synthesis of the backbone of several sesquiterpenes.
Structure−Activity Relationships for Inhibition of Inosine Monophosphate Dehydrogenase by Nuclear Variants of Mycophenolic Acid
作者:Peter H. Nelson、Stephen F. Carr、Bruce H. Devens、Elsie M. Eugui、Fidencio Franco、Carlos Gonzalez、Ronald C. Hawley、David G. Loughhead、David J. Milan、Eva Papp、John W. Patterson、Sussan Rouhafza、Eric B. Sjogren、David B. Smith、Rebecca A. Stephenson、Francisco X. Talamas、Ann-Marie Waltos、Robert J. Weikert、John C. Wu
DOI:10.1021/jm9603633
日期:1996.1.1
Structure-activity relationships in the region of the phthalide ring of the inosine monophosphate dehydrogenase inhibitor mycophenolic acid have been explored. Replacement of the lactone ring with other cyclic moieties resulted in loss of potency, especially for larger groups. Replacement of the ring by acyclic substituents also indicated a strong sensitivity to steric bulk. A phenolic hydroxyl group, with an adjacent hydrogen bond acceptor, was found to be essential for high potency. The aromatic methyl group was essential for activity; the methoxyl group could be replaced by ethyl to give a compound with 2-4 times the potency of mycophenolic acid in vitro and in vivo.
929. Chrom-3-en-6-ols. The action of pyridine on alk-2-enyl-benzoquinones
作者:D. McHale、J. Green
DOI:10.1039/jr9650005060
日期:——
An elegant and unprecedented approach to 2-methylbenzofurans
作者:Amit K. Yadav、Biswajit K. Singh、Nimisha Singh、Rama P. Tripathi
DOI:10.1016/j.tetlet.2007.07.118
日期:2007.9
An effective route for the synthesis of a variety of 2-methylbenzofurans is reported via DBU catalyzed dehydroiodination of easily accessible 2-iodomethyl-2,3-dihydrobenzofurans. The latter could be easily obtained by water mediated iodocyclization of allyl phenols. (c) 2007 Elsevier Ltd. All rights reserved.
HOFFMAN, W. F.;WOLTERSDORF, O. W. ,, JR;NOVELLO, F. C.;CRAGOE, E. J. ,, J+, J. MED. CHEM., 1981, 24, N 7, 865-873
作者:HOFFMAN, W. F.、WOLTERSDORF, O. W. ,, JR、NOVELLO, F. C.、CRAGOE, E. J. ,, J+