Natural Product-like Combinatorial Libraries Based on Privileged Structures. 1. General Principles and Solid-Phase Synthesis of Benzopyrans
作者:K. C. Nicolaou、J. A. Pfefferkorn、A. J. Roecker、G.-Q. Cao、S. Barluenga、H. J. Mitchell
DOI:10.1021/ja002033k
日期:2000.10.1
report a novel strategy for the design and construction of natural and natural product-like librariesbased on the principle of privileged structures, a term originally introduced to describe structural motifs capable of interacting with a variety of unrelated molecular targets. The identification of such privileged structures in naturalproducts is discussed, and subsequently the 2,2-dimethylbenzopyran
Studies of Substituent Effect on Asymmetric Epoxidation of Chromenes by Chiral Dioxirane
作者:O. Andrea Wong、Yian Shi
DOI:10.1021/jo0604179
日期:2006.5.1
A series of 6- and 8-substituted chromenes has been investigated for asymmetric epoxidation using chiral ketone catalysts. Up to 93% ee was achieved. Higher ee's are obtained when substrates are substituted at the 6- position. The enhanced enantioselectivity is likely due to the beneficial interaction between the 6-substituent of the substrate and the N-aryl or alkyl group of the ketone catalyst.
EVANS, J. M.;FAKE, C. S.;HAMILTON, T. C.;POYSER, R. H.;WATTS, E. A., J. MED. CHEM., 1983, 26, N 11, 1582-1589
作者:EVANS, J. M.、FAKE, C. S.、HAMILTON, T. C.、POYSER, R. H.、WATTS, E. A.
DOI:——
日期:——
Synthesis and antihypertensive activity of substituted trans-4-amino-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran-3-ols
作者:John M. Evans、Charles S. Fake、Thomas C. Hamilton、Robert H. Poyser、Eric A. Watts
DOI:10.1021/jm00365a007
日期:1983.11
position. Exceptions to this were the 7-nitro-4-pyrrolidine analogue and the 6-nitro-3-chloropropylamine, which retained marked antihypertensiveactivity. All of these compounds were direct vasodilators and had comparable antihypertensiveactivity to hydralazine and to the calcium antagonist, nifedipine. The synthetic route to these compounds involves cyclization of of propargyl ethers to 2H-1-benzopyrans
Copper(I) Iodide: A Catalyst for the Improved Synthesis of Aryl Propargyl Ethers
作者:David Bell、Mark R. Davies、Graham R. Geen、Inderjit S. Mann
DOI:10.1055/s-1995-3977
日期:1995.6
Copper(I) iodide catalyses the reaction between phenols and dialkylpropargyl chlorides to give aryl 1,1-dialkylpropargyl ethers 5a-k and 7a-e in good yields and purity. These ethers are important as precursors to the 2H-1-benzopyrans 8a-l and 9a-e.