13-Trialkyl(aryl)silyl-9-hydroxytriptycenes (trisilyltriptycenes) were synthesized by the triple addition of ynolates and 3-silylbenzynes with high regioselectivity. Benzenerings in the resulting triptycenes were highly distorted where the dihedral angles between the substituents were as high as 35°. The distortion energy induced step-by-step halogenation reactions to yield halogenated triptycenes, including chiral
Disclosed is a pharmaceutical composition comprising an aminoacyl tRNA synthetase inhibitor and another antibacterial agent, including another aminoacyl tRNA synthetase inhibitor.
Compounds of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are alkyl or aryl groups, A, B, C and D are non-reactive substituents or two are joined to form an additional ring, and Z is either of the formula Z': ##STR2## wherein R.sup.4 is H, lower alkyl or a cation; or a -6-oxotetrahydropyran-2-yl ring of the formula Z": ##STR3## e.g. 4-hydroxy-6-2-[2-(methyldiphenylsilyl)phenyl]ethenyl]ethyenyl}-tetrahydro -2H-pyran-2-one, (trans, trans). The compounds inhibit cholesterol biosynthesis and are useful as anti-atherosclerotic agents.
An improved process for converting an organosilane which comprises reacting at least one silane (A) having the formula R.sub.a SiCl.sub.4-a with at least one silane (B) which differs from silane (A) and has the formula R.sub.b SiCl.sub.4-b in the presence of an organoaluminum compound having the formula R.sub.c.sup.1 AlY.sub.3-c and at least one silane (C) having the formula R.sub.b H.sub.c SiCl.sub.4-b-c and from 0.1 to 5 percent by weight based on the weight of silanes (A), (B) and (C) of a hydrogen halide, in which R is a hydrocarbon radical having from 1 to 10 carbon atoms and is free of aliphatic unsaturation, R.sup.1 is an alkyl radical having from 1 to 4 carbon atoms, Y is selected from the group consisting of halogen, hydrogen or hydrocarbon radicals having from 1 to 10 carbon atoms which are bonded to the aluminum via oxygen and are free of aliphatic unsaturation, a is 2, 3 or 4, b is 0, 1, 2 or 3 and c is 1, 2 or 3 and the sum of b+c cannot exceed 4.