摘要:
The present invention relates to a method of converting .beta.-nitro compounds, specifically alcohols, into the corresponding hydroxy amines with retention of configuration by the use of ammonium formate.
摘要:
A method of controlling the diastereoselectivity of the nitroaldol reaction by the use of titanium, zirconium and aluminum based Lewis acids is disclosed. In a preferred embodiment, the reaction of lithium nitronate anion with aldehydes in THF/CH.sub.2 Cl.sub.2 at reduced temperature in the presence of isopropoxy titanium trichloride (TiCl.sub.3 (OPr.sup.i)) yields nitro alcohols enriched in the erythro diastereomer. Erythro-threo ratios of 11.2:1-3.4:1 for aromatic aldehydes and 3.8:1-1:1 for aliphatic aldehydes are typically obtained.
摘要:
Porphyrazines capable of localizing in a tumor of a mammal are disclosed. The porphyrazines are used in methods of imaging a tumor and in methods of treating tumors, either alone or in combination with a chemotherapeutic agent and/or radiation.
摘要:
The present invention relates to novel intermediates for the preparation of 3-methylenecephams of the formula IIA. wherein: R is a carboxylic acid protecting group; R1 is a group of the formula; R10 is C1-C6 alkyl, C1-C6 polyfluoroalkyl, C3-C6 cycloalkyl, adamantyl, phenyl, substituted phenyl, phenyl(C1-C3 alkyl), diphenylmethyl, or substituted phenyl(C1-C3 alkyl), or a group of the formula Z is solid polymer support; and Z1 is one or two groups independently selected from the group consisting of hydrogen, halo, hydroxy, protected hydroxy, nitro, cyano, trifluoromethyl, C1-C4 alkyl, and C1-C4 alkoxy.
摘要:
Porphyrazine compounds having moieties substituted at the eight peripheral .beta.-pyrrole positions are disclosed. The porphyrazine compounds have the general structural formula: ##STR1## wherein M is H.sub.2 or a metal capable of complexing with the pyrrole nitrogen atoms, and A, B, C and D are independently selected from the group consisting of a thio moiety, an amino moiety, an oxo moiety, a phospho moiety, a seleno moiety, a telluro moiety and a non-coordinating moiety, like a hydrocarbon moiety, with the proviso that not all of A, B, C and D are a thio moiety and that not all of A, B, C, and D are a hydrocarbon moiety. The porphyrazine compounds, depending on the identity of A, B, C and D, are capable of complexing one to four metal ions to the periphery of the porphyrazine to form a multimetallic porphyrazine. Multimetallic porphyrazine compounds can be linked by the peripherally-complexed metal ions to form a linear, i.e., ribbon, polymer or a two-dimension, i.e., sheet polymer. The porphyrazine compounds, and the multimetallic complexes and polymers derived therefrom, are useful in, or as, magnet materials, molecular metal conductors, pharmaceuticals, imaging agents, and dyes.