نتایج جستجو برای: transannular interaction
تعداد نتایج: 565925 فیلتر نتایج به سال:
CH3(O)2SOSi(OC6H2Me2CH2)3N (1), CH3OSi(OC6H2Me2CH2)3N (2) and CH3(O)2SO.Si(OCH2CH2)3N (3) have been synthesized in high yield by the reaction of 1-isothiocyanatosilatranes with dimethyl sulfite and methyl methanesulfonate. These novel silatranes have been characterized by elemental analysis, infrared spectroscopy, 1 H, 13 C, 29 Si NMR spectroscopy and mass spectrometry. Semi-empirical quantum m...
While thermolysis of the macrobicyclic triene lactone 12 did not produce the expected bicyclic transannular Diels-Alder (BTADA) product 13, heating the corresponding ether 18 to 110 °C for 4 h afforded a quantitative yield of the desired cycloadduct 19, which could be easily reduced to the perhydrophenanthrene, an ABC ring analogue of fusidic acid 1. Theoretical calculations with hybrid density...
Access to diastereoisomeric forms of original spirolactam frameworks and investigation of their folded potentials are depicted here. Taking advantage of a stereoselective ring-contraction reaction, the Transannular Rearrangement of Activated Lactams (TRAL), followed by two unprecedented tandem reactions, we describe here an efficient access to elegant spirocyclic scaffolds. After dimerization, ...
A 14-membered macrocycle with an allene and a furan strategically located at across the ring from each other is synthesized using an allene ring closing metathesis reaction. Upon treatment of the macrocycle with a catalytic amount of Pd(OAc)(2) and other additives, the first transannular [4+3] cycloaddition occurred to yield 37% of a tetracyclic compound containing the ABC ring structure of the...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید