Dearomative Intramolecular (4+3) Cycloadditions of Arenes with Epoxy and Aziridinyl Enolsilanes
作者:Jesse Ling、Sarah Lam、Kam-Hung Low、Pauline Chiu
DOI:10.1002/anie.201704155
日期:2017.7.17
enolsilanes with benzene, naphthalene, and anthracene derivatives is reported. Highly functionalized polycyclic alcohols and amines are generated under relatively mild reaction conditions with yields up to 89 %. Optically enriched cycloadducts are obtained from cycloadditions of enantiomerically pure epoxides and aziridines.
Synthesis and DHFR inhibitory activity of a series of 6-substituted-2,4-diaminothieno[2,3-d]pyrimidines
作者:I Donkor
DOI:10.1016/s0223-5234(03)00101-6
日期:2003.6
A series of 6-aralkyl substituted 2,4-diaminothieno[2,3-d]pyrimidines in which the 6-aryl group is separated from the thieno[2,3-d]pyrimidine ring by two to five methylene groups were synthesized and studied as inhibitors of dihydrofolate reductase from Pneumocystis carinii, Toxoplasma gondii, Mycobacterium avium, and rat liver. Compounds in which the thieno[2,3-d]pyrimidine ring is separated from the 6-aryl substituent by three methylene groups were the most potent inhibitors of the series (with IC50 values ranging from 0.24 and 11.0 muM) but those with two methylene groups between the aromatic rings were the most selective agents. (C) 2003 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
Mass spectrometry in structural and stereochemical problems. CCXV. Behavior of phenyl-substituted .alpha.,.beta.-unsaturated ketones upon electron impact. Promotion of hydrogen rearrangement processes
作者:R. J. Liedtke、A. F. Gerrard、J. Diekman、Carl Djerassi
DOI:10.1021/jo00970a025
日期:1972.3
4-Propargyl-2-azetidinone as a versatile synthon for the synthesis of .BETA.-lactam antibiotics : Hydrostannation and its reactivities.
An efficient preparation of 4-propargyl-2-azetidinone (6) from 4-phenylsulfonyl-2-azetidinone is described. This compound was converted to the ketones 14 and 16, which are the key intermediates for the synthesis of carbapenem and carbacephem antibiotics. In this transformation it was found that polar functional groups (β-lactam, OH, etc.) control the regiochemistry of hydrostannation of the internal alkyne. The reaction of epoxystannanes with formic acid to give the ketones is also described.
A Straightforward Approach to MMP-2 and MMP-9 Inhibitors Based on Chelate Claisen Rearrangements
作者:Jens L. Burkhart、Björn Diehl、Manfred J. Schmitt、Uli Kazmaier
DOI:10.1002/ejoc.201101318
日期:2012.1
The chelateClaisenrearrangement is a versatile tool for the stereoselective synthesis of β-substituted γ,δ-unsaturated amino acids, which can be converted into β-substitutedaspartates by oxidative cleavage. These are ideal precursors for the synthesis of hydroxamate-type MMP inhibitors.